WFCAM Science Archive

Glossary of WSA attributes

This Glossary alphabetically lists all attributes used in the UKIDSSDR2 database(s) held in the WSA. If you would like to have more information about the schema tables please use the UKIDSSDR2 Schema Browser (other Browser versions).

A B C D E F G H I J K L M
N O P Q R S T U V W X Y Z

H

Name Schema Table Database Description Type Length Unit Default Value Unified Content Descriptor

h2_1AperMag3 gpsJHKsource, gpsPointSource, reliableGpsPointSource WSA Default point/extended source 1st epoch H2 aperture corrected mag (2.0 arcsec aperture diameter) real 4 mag -0.9999995e9 PHOT_MAG

h2_1AperMag3 gpsSource WSA Default point/extended source 1st epoch H2 aperture corrected mag (2.0 arcsec aperture diameter)
If in doubt use this flux estimator real 4 mag -0.9999995e9 PHOT_MAG

h2_1AperMag3Err gpsJHKsource, gpsPointSource, gpsSource, reliableGpsPointSource WSA Error in default point/extended source 1st epoch H2 mag (2.0 arcsec aperture diameter) real 4 mag -0.9999995e9 ERROR

h2_1AperMag4 gpsJHKsource, gpsPointSource, gpsSource, reliableGpsPointSource WSA Extended source 1st epoch H2 aperture corrected mag (2.8 arcsec aperture diameter) real 4 mag -0.9999995e9 PHOT_MAG

h2_1AperMag4Err gpsJHKsource, gpsPointSource, gpsSource, reliableGpsPointSource WSA Error in extended source 1st epoch H2 mag (2.8 arcsec aperture diameter) real 4 mag -0.9999995e9 ERROR

h2_1AperMag6 gpsJHKsource, gpsPointSource, gpsSource, reliableGpsPointSource WSA Extended source 1st epoch H2 aperture corrected mag (5.7 arcsec aperture diameter) real 4 mag -0.9999995e9 PHOT_MAG

h2_1AperMag6Err gpsJHKsource, gpsPointSource, gpsSource, reliableGpsPointSource WSA Error in extended source 1st epoch H2 mag (5.7 arcsec aperture diameter) real 4 mag -0.9999995e9 ERROR

h2_1Class gpsJHKsource, gpsPointSource, gpsSource, gpsSourceRemeasurement, reliableGpsPointSource WSA discrete image classification flag in 1st epoch H2 smallint 2 -9999 CLASS_MISC

h2_1ClassStat gpsJHKsource, gpsPointSource, gpsSource, gpsSourceRemeasurement, reliableGpsPointSource WSA N(0,1) stellarness-of-profile statistic in 1st epoch H2 real 4 -0.9999995e9 STAT_PROP

h2_1Deblend gpsJHKsource, gpsPointSource, gpsSource, gpsSourceRemeasurement, reliableGpsPointSource WSA flag indicating parent/child relation in 1st epoch H2 int 4 -99999999 CODE_MISC

h2_1Ell gpsJHKsource, gpsPointSource, gpsSource, gpsSourceRemeasurement, reliableGpsPointSource WSA 1-b/a, where a/b=semi-major/minor axes in 1st epoch H2 real 4 -0.9999995e9 PHYS_ELLIPTICITY

h2_1eNum gpsJHKmergeLog, gpsMergeLog WSA the extension number of this 1st epoch H2 frame tinyint 1 NUMBER

h2_1ErrBits gpsJHKsource, gpsPointSource, gpsSourceRemeasurement, reliableGpsPointSource WSA processing warning/error bitwise flags in 1st epoch H2 int 4 -99999999 CODE_MISC

h2_1ErrBits gpsSource WSA processing warning/error bitwise flags in 1st epoch H2 int 4 -99999999 CODE_MISC

Apparently not actually an error bit flag, but a count of the number of zero confidence pixels in the default (2 arcsec diameter) aperture.

h2_1Eta gpsJHKsource, gpsPointSource, reliableGpsPointSource WSA Offset of 1st epoch H2 detection from master position (+north/-south) real 4 arcsec -0.9999995e9 POS_EQ_DEC_OFF

h2_1Eta gpsSource WSA Offset of 1st epoch H2 detection from master position (+north/-south) real 4 arcsec -0.9999995e9 POS_EQ_DEC_OFF

When associating individual passband detections into merged sources, a generous (in terms of the positional uncertainties) pairing radius of 2.0 (UKIDSS LAS and GPS; also non-survey programmes) or 1.0 (UKIDSS GPS, DXS and UDS) arcseconds is used, the higher value enabling pairing of moving sources when epoch separations may be several years. Such a large association criterion can of course lead to spurious pairings in the merged sources lists (although note that between passband pairs, handshake pairing is done: both passbands must agree that the candidate pair is their nearest neighbour for the pair to propagate through into the merged source table). In order to help filter spurious pairings out, and assuming that large positional offsets between the different passband detections are not expected (e.g. because of source motion, or larger than usual positional uncertainties) then the attributes Xi and Eta can be used to filter any pairings with suspiciously large offsets in one or more bands. For example, for a clean sample of QSOs from the LAS, you might wish to insist that the offsets in the selected sample are all below 1 arcsecond: simply add WHERE clauses into the SQL sample selection script to exclude all Xi and Eta values larger than the threshold you want.

h2_1Gausig gpsJHKsource, gpsPointSource, gpsSource, gpsSourceRemeasurement, reliableGpsPointSource WSA RMS of axes of ellipse fit in 1st epoch H2 real 4 pixels -0.9999995e9 MORPH_PARAM

h2_1HallMag gpsJHKsource, gpsPointSource, gpsSource, reliableGpsPointSource WSA Total point source 1st epoch H2 mag real 4 mag -0.9999995e9 PHOT_MAG

h2_1HallMagErr gpsJHKsource, gpsPointSource, gpsSource, reliableGpsPointSource WSA Error in total point source 1st epoch H2 mag real 4 mag -0.9999995e9 ERROR

h2_1Mag gpsSourceRemeasurement WSA 1st epoch H2 mag (as appropriate for this merged source) real 4 mag -0.9999995e9 PHOT_MAG

h2_1MagErr gpsSourceRemeasurement WSA Error in 1st epoch H2 mag real 4 mag -0.9999995e9 ERROR

h2_1mfID gpsJHKmergeLog, gpsMergeLog WSA the UID of the relevant 1st epoch H2 multiframe bigint 8 ID_FRAME

h2_1mk_1 gpsSourceRemeasurement WSA Default colour H2-K (using appropriate mags) real 4 mag PHOT_COLOR

h2_1mk_1Err gpsSourceRemeasurement WSA Error on colour H2-K real 4 mag ERROR

h2_1mk_1Ext gpsJHKsource, gpsPointSource, reliableGpsPointSource WSA Extended source colour H2-K (using aperMag3) real 4 mag -0.9999995e9 PHOT_COLOR

h2_1mk_1Ext gpsSource WSA Extended source colour H2-K (using aperMag3) real 4 mag -0.9999995e9 PHOT_COLOR

Default colours from pairs of adjacent passbands within a given set (e.g. Y-J, J-H and H-K for YJHK) are recorded in the merged source table for ease of querying and speedy querying via indexing of these attributes. Presently, the point-source colours and extended source colours are computed from the aperture corrected AperMag3 fixed 2 arcsec aperture diameter measures (for consistent measurement across all passbands) and generally good signal-to-noise. At some point in the future, this may be changed such that point-source colours will be computed from the PSF-fitted measures and extended source colours computed from the 2-d Sersic model profile fits.

h2_1mk_1ExtErr gpsJHKsource, gpsPointSource, reliableGpsPointSource WSA Error on extended source colour H2-K real 4 mag -0.9999995e9 ERROR

h2_1mk_1ExtErr gpsSource WSA Error on extended source colour H2-K real 4 mag -0.9999995e9 ERROR

Default colours from pairs of adjacent passbands within a given set (e.g. Y-J, J-H and H-K for YJHK) are recorded in the merged source table for ease of querying and speedy querying via indexing of these attributes. Presently, the point-source colours and extended source colours are computed from the aperture corrected AperMag3 fixed 2 arcsec aperture diameter measures (for consistent measurement across all passbands) and generally good signal-to-noise. At some point in the future, this may be changed such that point-source colours will be computed from the PSF-fitted measures and extended source colours computed from the 2-d Sersic model profile fits.

h2_1mk_1Pnt gpsJHKsource, gpsPointSource, reliableGpsPointSource WSA Point source colour H2-K (using aperMag3) real 4 mag -0.9999995e9 PHOT_COLOR

h2_1mk_1Pnt gpsSource WSA Point source colour H2-K (using aperMag3) real 4 mag -0.9999995e9 PHOT_COLOR

Default colours from pairs of adjacent passbands within a given set (e.g. Y-J, J-H and H-K for YJHK) are recorded in the merged source table for ease of querying and speedy querying via indexing of these attributes. Presently, the point-source colours and extended source colours are computed from the aperture corrected AperMag3 fixed 2 arcsec aperture diameter measures (for consistent measurement across all passbands) and generally good signal-to-noise. At some point in the future, this may be changed such that point-source colours will be computed from the PSF-fitted measures and extended source colours computed from the 2-d Sersic model profile fits.

h2_1mk_1PntErr gpsJHKsource, gpsPointSource, reliableGpsPointSource WSA Error on point source colour H2-K real 4 mag -0.9999995e9 ERROR

h2_1mk_1PntErr gpsSource WSA Error on point source colour H2-K real 4 mag -0.9999995e9 ERROR

Default colours from pairs of adjacent passbands within a given set (e.g. Y-J, J-H and H-K for YJHK) are recorded in the merged source table for ease of querying and speedy querying via indexing of these attributes. Presently, the point-source colours and extended source colours are computed from the aperture corrected AperMag3 fixed 2 arcsec aperture diameter measures (for consistent measurement across all passbands) and generally good signal-to-noise. At some point in the future, this may be changed such that point-source colours will be computed from the PSF-fitted measures and extended source colours computed from the 2-d Sersic model profile fits.

h2_1ObjID gpsJHKsource, gpsPointSource, gpsSource, reliableGpsPointSource WSA the UID of the 1st epoch H2 detection bigint 8 -99999999 ID_NUMBER

h2_1ObjID gpsSourceRemeasurement WSA the UID of the 1st epoch H2 remeasurement bigint 8 -99999999 ID_NUMBER

h2_1PA gpsJHKsource, gpsPointSource, gpsSource, gpsSourceRemeasurement, reliableGpsPointSource WSA ellipse fit celestial orientation in 1st epoch H2 real 4 Degrees -0.9999995e9 POS_POS-ANG

h2_1PetroMag gpsJHKsource, gpsPointSource, gpsSource, reliableGpsPointSource WSA Extended source 1st epoch H2 mag (Petrosian) real 4 mag -0.9999995e9 PHOT_MAG

h2_1PetroMagErr gpsJHKsource, gpsPointSource, gpsSource, reliableGpsPointSource WSA Error in extended source 1st epoch H2 mag (Petrosian) real 4 mag -0.9999995e9 ERROR

h2_1ppErrBits gpsJHKsource, gpsPointSource, gpsSourceRemeasurement, reliableGpsPointSource WSA additional WFAU post-processing error bits in 1st epoch H2 int 4 0 CODE_MISC

h2_1ppErrBits gpsSource WSA additional WFAU post-processing error bits in 1st epoch H2 int 4 0 CODE_MISC

Post-processing error quality bit flags assigned (NB: from UKIDSS DR2 release onwards) in the WSA curation procedure for survey data. From least to most significant byte in the 4-byte integer attribute byte 0 (bits 0 to 7) corresponds to information on generally innocuous conditions that are nonetheless potentially significant as regards the integrity of that detection; byte 1 (bits 8 to 15) corresponds to warnings; byte 2 (bits 16 to 23) corresponds to important warnings; and finally byte 3 (bits 24 to 31) corresponds to severe warnings:

Byte Bit Detection quality issue Threshold or bit mask Applies to

Decimal Hexadecimal

0 4 Deblended 16 0x00000010 LAS, GCS, GPS, DXS

0 6 Bad pixel(s) in default aperture 64 0x00000040 LAS, GCS, GPS, DXS

2 16 Close to saturated 65536 0x00010000 LAS, GCS, GPS

2 19 Possible crosstalk artefact/contamination 524288 0x00080000 LAS, GCS, DXS

2 22 Lies within a dither offset of the stacked frame boundary 4194304 0x00400000 LAS, GCS, GPS, DXS

In this way, the higher the error quality bit flag value, the more likely it is that the detection is spurious. The decimal threshold (column 4) gives the minimum value of the quality flag for a detection having the given condition (since other bits in the flag may be set also; the corresponding hexadecimal value, where each digit corresponds to 4 bits in the flag, can be easier to compute when writing SQL queries to test for a given condition). For example, to exclude all K band sources in the LAS having any error quality condition other than informational ones, include a predicate ... AND kppErrBits ≤ 255. See the SQL Cookbook and other online pages for further information.

h2_1PsfMag gpsJHKsource, gpsPointSource, gpsSource, reliableGpsPointSource WSA Point source profile-fitted 1st epoch H2 mag real 4 mag -0.9999995e9 PHOT_MAG

h2_1PsfMagErr gpsJHKsource, gpsPointSource, gpsSource, reliableGpsPointSource WSA Error in point source profile-fitted 1st epoch H2 mag real 4 mag -0.9999995e9 ERROR

h2_1SeqNum gpsJHKsource, gpsPointSource, gpsSource, reliableGpsPointSource WSA the running number of the 1st epoch H2 detection int 4 -99999999 ID_NUMBER

h2_1SeqNum gpsSourceRemeasurement WSA the running number of the 1st epoch H2 remeasurement int 4 -99999999 ID_NUMBER

h2_1SerMag2D gpsJHKsource, gpsPointSource, gpsSource, reliableGpsPointSource WSA Extended source 1st epoch H2 mag (profile-fitted) real 4 mag -0.9999995e9 PHOT_MAG

h2_1SerMag2DErr gpsJHKsource, gpsPointSource, gpsSource, reliableGpsPointSource WSA Error in extended source 1st epoch H2 mag (profile-fitted) real 4 mag -0.9999995e9 ERROR

h2_1Xi gpsJHKsource, gpsPointSource, reliableGpsPointSource WSA Offset of 1st epoch H2 detection from master position (+east/-west) real 4 arcsec -0.9999995e9 POS_EQ_RA_OFF

h2_1Xi gpsSource WSA Offset of 1st epoch H2 detection from master position (+east/-west) real 4 arcsec -0.9999995e9 POS_EQ_RA_OFF

When associating individual passband detections into merged sources, a generous (in terms of the positional uncertainties) pairing radius of 2.0 (UKIDSS LAS and GPS; also non-survey programmes) or 1.0 (UKIDSS GPS, DXS and UDS) arcseconds is used, the higher value enabling pairing of moving sources when epoch separations may be several years. Such a large association criterion can of course lead to spurious pairings in the merged sources lists (although note that between passband pairs, handshake pairing is done: both passbands must agree that the candidate pair is their nearest neighbour for the pair to propagate through into the merged source table). In order to help filter spurious pairings out, and assuming that large positional offsets between the different passband detections are not expected (e.g. because of source motion, or larger than usual positional uncertainties) then the attributes Xi and Eta can be used to filter any pairings with suspiciously large offsets in one or more bands. For example, for a clean sample of QSOs from the LAS, you might wish to insist that the offsets in the selected sample are all below 1 arcsecond: simply add WHERE clauses into the SQL sample selection script to exclude all Xi and Eta values larger than the threshold you want.

h2_2AperMag3 gpsJHKsource, gpsPointSource, reliableGpsPointSource WSA Default point/extended source 2nd epoch H2 aperture corrected mag (2.0 arcsec aperture diameter) real 4 mag -0.9999995e9 PHOT_MAG

h2_2AperMag3 gpsSource WSA Default point/extended source 2nd epoch H2 aperture corrected mag (2.0 arcsec aperture diameter)
If in doubt use this flux estimator real 4 mag -0.9999995e9 PHOT_MAG

h2_2AperMag3Err gpsJHKsource, gpsPointSource, gpsSource, reliableGpsPointSource WSA Error in default point/extended source 2nd epoch H2 mag (2.0 arcsec aperture diameter) real 4 mag -0.9999995e9 ERROR

h2_2AperMag4 gpsJHKsource, gpsPointSource, gpsSource, reliableGpsPointSource WSA Extended source 2nd epoch H2 aperture corrected mag (2.8 arcsec aperture diameter) real 4 mag -0.9999995e9 PHOT_MAG

h2_2AperMag4Err gpsJHKsource, gpsPointSource, gpsSource, reliableGpsPointSource WSA Error in extended source 2nd epoch H2 mag (2.8 arcsec aperture diameter) real 4 mag -0.9999995e9 ERROR

h2_2AperMag6 gpsJHKsource, gpsPointSource, gpsSource, reliableGpsPointSource WSA Extended source 2nd epoch H2 aperture corrected mag (5.7 arcsec aperture diameter) real 4 mag -0.9999995e9 PHOT_MAG

h2_2AperMag6Err gpsJHKsource, gpsPointSource, gpsSource, reliableGpsPointSource WSA Error in extended source 2nd epoch H2 mag (5.7 arcsec aperture diameter) real 4 mag -0.9999995e9 ERROR

h2_2Class gpsJHKsource, gpsPointSource, gpsSource, gpsSourceRemeasurement, reliableGpsPointSource WSA discrete image classification flag in 2nd epoch H2 smallint 2 -9999 CLASS_MISC

h2_2ClassStat gpsJHKsource, gpsPointSource, gpsSource, gpsSourceRemeasurement, reliableGpsPointSource WSA N(0,1) stellarness-of-profile statistic in 2nd epoch H2 real 4 -0.9999995e9 STAT_PROP

h2_2Deblend gpsJHKsource, gpsPointSource, gpsSource, gpsSourceRemeasurement, reliableGpsPointSource WSA flag indicating parent/child relation in 2nd epoch H2 int 4 -99999999 CODE_MISC

h2_2Ell gpsJHKsource, gpsPointSource, gpsSource, gpsSourceRemeasurement, reliableGpsPointSource WSA 1-b/a, where a/b=semi-major/minor axes in 2nd epoch H2 real 4 -0.9999995e9 PHYS_ELLIPTICITY

h2_2eNum gpsJHKmergeLog, gpsMergeLog WSA the extension number of this 2nd epoch H2 frame tinyint 1 NUMBER

h2_2ErrBits gpsJHKsource, gpsPointSource, gpsSourceRemeasurement, reliableGpsPointSource WSA processing warning/error bitwise flags in 2nd epoch H2 int 4 -99999999 CODE_MISC

h2_2ErrBits gpsSource WSA processing warning/error bitwise flags in 2nd epoch H2 int 4 -99999999 CODE_MISC

Apparently not actually an error bit flag, but a count of the number of zero confidence pixels in the default (2 arcsec diameter) aperture.

h2_2Eta gpsJHKsource, gpsPointSource, reliableGpsPointSource WSA Offset of 2nd epoch H2 detection from master position (+north/-south) real 4 arcsec -0.9999995e9 POS_EQ_DEC_OFF

h2_2Eta gpsSource WSA Offset of 2nd epoch H2 detection from master position (+north/-south) real 4 arcsec -0.9999995e9 POS_EQ_DEC_OFF

When associating individual passband detections into merged sources, a generous (in terms of the positional uncertainties) pairing radius of 2.0 (UKIDSS LAS and GPS; also non-survey programmes) or 1.0 (UKIDSS GPS, DXS and UDS) arcseconds is used, the higher value enabling pairing of moving sources when epoch separations may be several years. Such a large association criterion can of course lead to spurious pairings in the merged sources lists (although note that between passband pairs, handshake pairing is done: both passbands must agree that the candidate pair is their nearest neighbour for the pair to propagate through into the merged source table). In order to help filter spurious pairings out, and assuming that large positional offsets between the different passband detections are not expected (e.g. because of source motion, or larger than usual positional uncertainties) then the attributes Xi and Eta can be used to filter any pairings with suspiciously large offsets in one or more bands. For example, for a clean sample of QSOs from the LAS, you might wish to insist that the offsets in the selected sample are all below 1 arcsecond: simply add WHERE clauses into the SQL sample selection script to exclude all Xi and Eta values larger than the threshold you want.

h2_2Gausig gpsJHKsource, gpsPointSource, gpsSource, gpsSourceRemeasurement, reliableGpsPointSource WSA RMS of axes of ellipse fit in 2nd epoch H2 real 4 pixels -0.9999995e9 MORPH_PARAM

h2_2HallMag gpsJHKsource, gpsPointSource, gpsSource, reliableGpsPointSource WSA Total point source 2nd epoch H2 mag real 4 mag -0.9999995e9 PHOT_MAG

h2_2HallMagErr gpsJHKsource, gpsPointSource, gpsSource, reliableGpsPointSource WSA Error in total point source 2nd epoch H2 mag real 4 mag -0.9999995e9 ERROR

h2_2Mag gpsSourceRemeasurement WSA 2nd epoch H2 mag (as appropriate for this merged source) real 4 mag -0.9999995e9 PHOT_MAG

h2_2MagErr gpsSourceRemeasurement WSA Error in 2nd epoch H2 mag real 4 mag -0.9999995e9 ERROR

h2_2mfID gpsJHKmergeLog, gpsMergeLog WSA the UID of the relevant 2nd epoch H2 multiframe bigint 8 ID_FRAME

h2_2ObjID gpsJHKsource, gpsPointSource, gpsSource, reliableGpsPointSource WSA the UID of the 2nd epoch H2 detection bigint 8 -99999999 ID_NUMBER

h2_2ObjID gpsSourceRemeasurement WSA the UID of the 2nd epoch H2 remeasurement bigint 8 -99999999 ID_NUMBER

h2_2PA gpsJHKsource, gpsPointSource, gpsSource, gpsSourceRemeasurement, reliableGpsPointSource WSA ellipse fit celestial orientation in 2nd epoch H2 real 4 Degrees -0.9999995e9 POS_POS-ANG

h2_2PetroMag gpsJHKsource, gpsPointSource, gpsSource, reliableGpsPointSource WSA Extended source 2nd epoch H2 mag (Petrosian) real 4 mag -0.9999995e9 PHOT_MAG

h2_2PetroMagErr gpsJHKsource, gpsPointSource, gpsSource, reliableGpsPointSource WSA Error in extended source 2nd epoch H2 mag (Petrosian) real 4 mag -0.9999995e9 ERROR

h2_2ppErrBits gpsJHKsource, gpsPointSource, gpsSourceRemeasurement, reliableGpsPointSource WSA additional WFAU post-processing error bits in 2nd epoch H2 int 4 0 CODE_MISC

h2_2ppErrBits gpsSource WSA additional WFAU post-processing error bits in 2nd epoch H2 int 4 0 CODE_MISC

Post-processing error quality bit flags assigned (NB: from UKIDSS DR2 release onwards) in the WSA curation procedure for survey data. From least to most significant byte in the 4-byte integer attribute byte 0 (bits 0 to 7) corresponds to information on generally innocuous conditions that are nonetheless potentially significant as regards the integrity of that detection; byte 1 (bits 8 to 15) corresponds to warnings; byte 2 (bits 16 to 23) corresponds to important warnings; and finally byte 3 (bits 24 to 31) corresponds to severe warnings:

Byte Bit Detection quality issue Threshold or bit mask Applies to

Decimal Hexadecimal

0 4 Deblended 16 0x00000010 LAS, GCS, GPS, DXS

0 6 Bad pixel(s) in default aperture 64 0x00000040 LAS, GCS, GPS, DXS

2 16 Close to saturated 65536 0x00010000 LAS, GCS, GPS

2 19 Possible crosstalk artefact/contamination 524288 0x00080000 LAS, GCS, DXS

2 22 Lies within a dither offset of the stacked frame boundary 4194304 0x00400000 LAS, GCS, GPS, DXS

In this way, the higher the error quality bit flag value, the more likely it is that the detection is spurious. The decimal threshold (column 4) gives the minimum value of the quality flag for a detection having the given condition (since other bits in the flag may be set also; the corresponding hexadecimal value, where each digit corresponds to 4 bits in the flag, can be easier to compute when writing SQL queries to test for a given condition). For example, to exclude all K band sources in the LAS having any error quality condition other than informational ones, include a predicate ... AND kppErrBits ≤ 255. See the SQL Cookbook and other online pages for further information.

h2_2PsfMag gpsJHKsource, gpsPointSource, gpsSource, reliableGpsPointSource WSA Point source profile-fitted 2nd epoch H2 mag real 4 mag -0.9999995e9 PHOT_MAG

h2_2PsfMagErr gpsJHKsource, gpsPointSource, gpsSource, reliableGpsPointSource WSA Error in point source profile-fitted 2nd epoch H2 mag real 4 mag -0.9999995e9 ERROR

h2_2SeqNum gpsJHKsource, gpsPointSource, gpsSource, reliableGpsPointSource WSA the running number of the 2nd epoch H2 detection int 4 -99999999 ID_NUMBER

h2_2SeqNum gpsSourceRemeasurement WSA the running number of the 2nd epoch H2 remeasurement int 4 -99999999 ID_NUMBER

h2_2SerMag2D gpsJHKsource, gpsPointSource, gpsSource, reliableGpsPointSource WSA Extended source 2nd epoch H2 mag (profile-fitted) real 4 mag -0.9999995e9 PHOT_MAG

h2_2SerMag2DErr gpsJHKsource, gpsPointSource, gpsSource, reliableGpsPointSource WSA Error in extended source 2nd epoch H2 mag (profile-fitted) real 4 mag -0.9999995e9 ERROR

h2_2Xi gpsJHKsource, gpsPointSource, reliableGpsPointSource WSA Offset of 2nd epoch H2 detection from master position (+east/-west) real 4 arcsec -0.9999995e9 POS_EQ_RA_OFF

h2_2Xi gpsSource WSA Offset of 2nd epoch H2 detection from master position (+east/-west) real 4 arcsec -0.9999995e9 POS_EQ_RA_OFF

When associating individual passband detections into merged sources, a generous (in terms of the positional uncertainties) pairing radius of 2.0 (UKIDSS LAS and GPS; also non-survey programmes) or 1.0 (UKIDSS GPS, DXS and UDS) arcseconds is used, the higher value enabling pairing of moving sources when epoch separations may be several years. Such a large association criterion can of course lead to spurious pairings in the merged sources lists (although note that between passband pairs, handshake pairing is done: both passbands must agree that the candidate pair is their nearest neighbour for the pair to propagate through into the merged source table). In order to help filter spurious pairings out, and assuming that large positional offsets between the different passband detections are not expected (e.g. because of source motion, or larger than usual positional uncertainties) then the attributes Xi and Eta can be used to filter any pairings with suspiciously large offsets in one or more bands. For example, for a clean sample of QSOs from the LAS, you might wish to insist that the offsets in the selected sample are all below 1 arcsecond: simply add WHERE clauses into the SQL sample selection script to exclude all Xi and Eta values larger than the threshold you want.

h2_3AperMag3 gpsJHKsource, gpsPointSource, reliableGpsPointSource WSA Default point/extended source 3rd epoch H2 aperture corrected mag (2.0 arcsec aperture diameter) real 4 mag -0.9999995e9 PHOT_MAG

h2_3AperMag3 gpsSource WSA Default point/extended source 3rd epoch H2 aperture corrected mag (2.0 arcsec aperture diameter)
If in doubt use this flux estimator real 4 mag -0.9999995e9 PHOT_MAG

h2_3AperMag3Err gpsJHKsource, gpsPointSource, gpsSource, reliableGpsPointSource WSA Error in default point/extended source 3rd epoch H2 mag (2.0 arcsec aperture diameter) real 4 mag -0.9999995e9 ERROR

h2_3AperMag4 gpsJHKsource, gpsPointSource, gpsSource, reliableGpsPointSource WSA Extended source 3rd epoch H2 aperture corrected mag (2.8 arcsec aperture diameter) real 4 mag -0.9999995e9 PHOT_MAG

h2_3AperMag4Err gpsJHKsource, gpsPointSource, gpsSource, reliableGpsPointSource WSA Error in extended source 3rd epoch H2 mag (2.8 arcsec aperture diameter) real 4 mag -0.9999995e9 ERROR

h2_3AperMag6 gpsJHKsource, gpsPointSource, gpsSource, reliableGpsPointSource WSA Extended source 3rd epoch H2 aperture corrected mag (5.7 arcsec aperture diameter) real 4 mag -0.9999995e9 PHOT_MAG

h2_3AperMag6Err gpsJHKsource, gpsPointSource, gpsSource, reliableGpsPointSource WSA Error in extended source 3rd epoch H2 mag (5.7 arcsec aperture diameter) real 4 mag -0.9999995e9 ERROR

h2_3Class gpsJHKsource, gpsPointSource, gpsSource, gpsSourceRemeasurement, reliableGpsPointSource WSA discrete image classification flag in 3rd epoch H2 smallint 2 -9999 CLASS_MISC

h2_3ClassStat gpsJHKsource, gpsPointSource, gpsSource, gpsSourceRemeasurement, reliableGpsPointSource WSA N(0,1) stellarness-of-profile statistic in 3rd epoch H2 real 4 -0.9999995e9 STAT_PROP

h2_3Deblend gpsJHKsource, gpsPointSource, gpsSource, gpsSourceRemeasurement, reliableGpsPointSource WSA flag indicating parent/child relation in 3rd epoch H2 int 4 -99999999 CODE_MISC

h2_3Ell gpsJHKsource, gpsPointSource, gpsSource, gpsSourceRemeasurement, reliableGpsPointSource WSA 1-b/a, where a/b=semi-major/minor axes in 3rd epoch H2 real 4 -0.9999995e9 PHYS_ELLIPTICITY

h2_3eNum gpsJHKmergeLog, gpsMergeLog WSA the extension number of this 3rd epoch H2 frame tinyint 1 NUMBER

h2_3ErrBits gpsJHKsource, gpsPointSource, gpsSourceRemeasurement, reliableGpsPointSource WSA processing warning/error bitwise flags in 3rd epoch H2 int 4 -99999999 CODE_MISC

h2_3ErrBits gpsSource WSA processing warning/error bitwise flags in 3rd epoch H2 int 4 -99999999 CODE_MISC

Apparently not actually an error bit flag, but a count of the number of zero confidence pixels in the default (2 arcsec diameter) aperture.

h2_3Eta gpsJHKsource, gpsPointSource, reliableGpsPointSource WSA Offset of 3rd epoch H2 detection from master position (+north/-south) real 4 arcsec -0.9999995e9 POS_EQ_DEC_OFF

h2_3Eta gpsSource WSA Offset of 3rd epoch H2 detection from master position (+north/-south) real 4 arcsec -0.9999995e9 POS_EQ_DEC_OFF

When associating individual passband detections into merged sources, a generous (in terms of the positional uncertainties) pairing radius of 2.0 (UKIDSS LAS and GPS; also non-survey programmes) or 1.0 (UKIDSS GPS, DXS and UDS) arcseconds is used, the higher value enabling pairing of moving sources when epoch separations may be several years. Such a large association criterion can of course lead to spurious pairings in the merged sources lists (although note that between passband pairs, handshake pairing is done: both passbands must agree that the candidate pair is their nearest neighbour for the pair to propagate through into the merged source table). In order to help filter spurious pairings out, and assuming that large positional offsets between the different passband detections are not expected (e.g. because of source motion, or larger than usual positional uncertainties) then the attributes Xi and Eta can be used to filter any pairings with suspiciously large offsets in one or more bands. For example, for a clean sample of QSOs from the LAS, you might wish to insist that the offsets in the selected sample are all below 1 arcsecond: simply add WHERE clauses into the SQL sample selection script to exclude all Xi and Eta values larger than the threshold you want.

h2_3Gausig gpsJHKsource, gpsPointSource, gpsSource, gpsSourceRemeasurement, reliableGpsPointSource WSA RMS of axes of ellipse fit in 3rd epoch H2 real 4 pixels -0.9999995e9 MORPH_PARAM

h2_3HallMag gpsJHKsource, gpsPointSource, gpsSource, reliableGpsPointSource WSA Total point source 3rd epoch H2 mag real 4 mag -0.9999995e9 PHOT_MAG

h2_3HallMagErr gpsJHKsource, gpsPointSource, gpsSource, reliableGpsPointSource WSA Error in total point source 3rd epoch H2 mag real 4 mag -0.9999995e9 ERROR

h2_3Mag gpsSourceRemeasurement WSA 3rd epoch H2 mag (as appropriate for this merged source) real 4 mag -0.9999995e9 PHOT_MAG

h2_3MagErr gpsSourceRemeasurement WSA Error in 3rd epoch H2 mag real 4 mag -0.9999995e9 ERROR

h2_3mfID gpsJHKmergeLog, gpsMergeLog WSA the UID of the relevant 3rd epoch H2 multiframe bigint 8 ID_FRAME

h2_3ObjID gpsJHKsource, gpsPointSource, gpsSource, reliableGpsPointSource WSA the UID of the 3rd epoch H2 detection bigint 8 -99999999 ID_NUMBER

h2_3ObjID gpsSourceRemeasurement WSA the UID of the 3rd epoch H2 remeasurement bigint 8 -99999999 ID_NUMBER

h2_3PA gpsJHKsource, gpsPointSource, gpsSource, gpsSourceRemeasurement, reliableGpsPointSource WSA ellipse fit celestial orientation in 3rd epoch H2 real 4 Degrees -0.9999995e9 POS_POS-ANG

h2_3PetroMag gpsJHKsource, gpsPointSource, gpsSource, reliableGpsPointSource WSA Extended source 3rd epoch H2 mag (Petrosian) real 4 mag -0.9999995e9 PHOT_MAG

h2_3PetroMagErr gpsJHKsource, gpsPointSource, gpsSource, reliableGpsPointSource WSA Error in extended source 3rd epoch H2 mag (Petrosian) real 4 mag -0.9999995e9 ERROR

h2_3ppErrBits gpsJHKsource, gpsPointSource, gpsSourceRemeasurement, reliableGpsPointSource WSA additional WFAU post-processing error bits in 3rd epoch H2 int 4 0 CODE_MISC

h2_3ppErrBits gpsSource WSA additional WFAU post-processing error bits in 3rd epoch H2 int 4 0 CODE_MISC

Post-processing error quality bit flags assigned (NB: from UKIDSS DR2 release onwards) in the WSA curation procedure for survey data. From least to most significant byte in the 4-byte integer attribute byte 0 (bits 0 to 7) corresponds to information on generally innocuous conditions that are nonetheless potentially significant as regards the integrity of that detection; byte 1 (bits 8 to 15) corresponds to warnings; byte 2 (bits 16 to 23) corresponds to important warnings; and finally byte 3 (bits 24 to 31) corresponds to severe warnings:

Byte Bit Detection quality issue Threshold or bit mask Applies to

Decimal Hexadecimal

0 4 Deblended 16 0x00000010 LAS, GCS, GPS, DXS

0 6 Bad pixel(s) in default aperture 64 0x00000040 LAS, GCS, GPS, DXS

2 16 Close to saturated 65536 0x00010000 LAS, GCS, GPS

2 19 Possible crosstalk artefact/contamination 524288 0x00080000 LAS, GCS, DXS

2 22 Lies within a dither offset of the stacked frame boundary 4194304 0x00400000 LAS, GCS, GPS, DXS

In this way, the higher the error quality bit flag value, the more likely it is that the detection is spurious. The decimal threshold (column 4) gives the minimum value of the quality flag for a detection having the given condition (since other bits in the flag may be set also; the corresponding hexadecimal value, where each digit corresponds to 4 bits in the flag, can be easier to compute when writing SQL queries to test for a given condition). For example, to exclude all K band sources in the LAS having any error quality condition other than informational ones, include a predicate ... AND kppErrBits ≤ 255. See the SQL Cookbook and other online pages for further information.

h2_3PsfMag gpsJHKsource, gpsPointSource, gpsSource, reliableGpsPointSource WSA Point source profile-fitted 3rd epoch H2 mag real 4 mag -0.9999995e9 PHOT_MAG

h2_3PsfMagErr gpsJHKsource, gpsPointSource, gpsSource, reliableGpsPointSource WSA Error in point source profile-fitted 3rd epoch H2 mag real 4 mag -0.9999995e9 ERROR

h2_3SeqNum gpsJHKsource, gpsPointSource, gpsSource, reliableGpsPointSource WSA the running number of the 3rd epoch H2 detection int 4 -99999999 ID_NUMBER

h2_3SeqNum gpsSourceRemeasurement WSA the running number of the 3rd epoch H2 remeasurement int 4 -99999999 ID_NUMBER

h2_3SerMag2D gpsJHKsource, gpsPointSource, gpsSource, reliableGpsPointSource WSA Extended source 3rd epoch H2 mag (profile-fitted) real 4 mag -0.9999995e9 PHOT_MAG

h2_3SerMag2DErr gpsJHKsource, gpsPointSource, gpsSource, reliableGpsPointSource WSA Error in extended source 3rd epoch H2 mag (profile-fitted) real 4 mag -0.9999995e9 ERROR

h2_3Xi gpsJHKsource, gpsPointSource, reliableGpsPointSource WSA Offset of 3rd epoch H2 detection from master position (+east/-west) real 4 arcsec -0.9999995e9 POS_EQ_RA_OFF

h2_3Xi gpsSource WSA Offset of 3rd epoch H2 detection from master position (+east/-west) real 4 arcsec -0.9999995e9 POS_EQ_RA_OFF

When associating individual passband detections into merged sources, a generous (in terms of the positional uncertainties) pairing radius of 2.0 (UKIDSS LAS and GPS; also non-survey programmes) or 1.0 (UKIDSS GPS, DXS and UDS) arcseconds is used, the higher value enabling pairing of moving sources when epoch separations may be several years. Such a large association criterion can of course lead to spurious pairings in the merged sources lists (although note that between passband pairs, handshake pairing is done: both passbands must agree that the candidate pair is their nearest neighbour for the pair to propagate through into the merged source table). In order to help filter spurious pairings out, and assuming that large positional offsets between the different passband detections are not expected (e.g. because of source motion, or larger than usual positional uncertainties) then the attributes Xi and Eta can be used to filter any pairings with suspiciously large offsets in one or more bands. For example, for a clean sample of QSOs from the LAS, you might wish to insist that the offsets in the selected sample are all below 1 arcsecond: simply add WHERE clauses into the SQL sample selection script to exclude all Xi and Eta values larger than the threshold you want.

h2Mag CurrentStdStarInfo, PreviousStdStarInfo WSA H2 band total magnitude of star (from external sources if primary) real 4 mag PHOT_INT-MAG

h2MagErr CurrentStdStarInfo, PreviousStdStarInfo WSA H2 band magnitude error of star real 4 mag ERROR

h_2mrat twomass_scn 2MASS H-band average 2nd image moment ratio. real 4 FIT_PARAM_VALUE

h_5sig_ba twomass_xsc 2MASS H minor/major axis ratio fit to the 5-sigma isophote. real 4 PHYS_AXIS-RATIO

h_5sig_phi twomass_xsc 2MASS H angle to 5-sigma major axis (E of N). smallint 2 degrees ERROR

h_5surf twomass_xsc 2MASS H central surface brightness (r<=5). real 4 mag PHOT_SB_GENERAL

h_ba twomass_xsc 2MASS H minor/major axis ratio fit to the 3-sigma isophote. real 4 PHYS_AXIS-RATIO

h_back twomass_xsc 2MASS H coadd median background. real 4 CODE_MISC

h_bisym_chi twomass_xsc 2MASS H bi-symmetric cross-correlation chi. real 4 FIT_PARAM_VALUE

h_bisym_rat twomass_xsc 2MASS H bi-symmetric flux ratio. real 4 PHOT_FLUX_RATIO

h_bndg_amp twomass_xsc 2MASS H banding maximum FT amplitude on this side of coadd. real 4 DN FIT_PARAM_VALUE

h_bndg_per twomass_xsc 2MASS H banding Fourier Transf. period on this side of coadd. int 4 arcsec FIT_PARAM_VALUE

h_cmsig twomass_psc 2MASS Corrected photometric uncertainty for the default H-band magnitude. real 4 mag SPECT_FLUX_VALUE

h_con_indx twomass_xsc 2MASS H concentration index r_75%/r_25%. real 4 PHYS_CONCENT_INDEX

h_d_area twomass_xsc 2MASS H 5-sigma to 3-sigma differential area. smallint 2 FIT_RESIDUAL

h_flg_10 twomass_xsc 2MASS H confusion flag for 10 arcsec circular ap. mag. smallint 2 CODE_MISC

h_flg_15 twomass_xsc 2MASS H confusion flag for 15 arcsec circular ap. mag. smallint 2 CODE_MISC

h_flg_20 twomass_xsc 2MASS H confusion flag for 20 arcsec circular ap. mag. smallint 2 CODE_MISC

h_flg_25 twomass_xsc 2MASS H confusion flag for 25 arcsec circular ap. mag. smallint 2 CODE_MISC

h_flg_30 twomass_xsc 2MASS H confusion flag for 30 arcsec circular ap. mag. smallint 2 CODE_MISC

h_flg_40 twomass_xsc 2MASS H confusion flag for 40 arcsec circular ap. mag. smallint 2 CODE_MISC

h_flg_5 twomass_xsc 2MASS H confusion flag for 5 arcsec circular ap. mag. smallint 2 CODE_MISC

h_flg_50 twomass_xsc 2MASS H confusion flag for 50 arcsec circular ap. mag. smallint 2 CODE_MISC

h_flg_60 twomass_xsc 2MASS H confusion flag for 60 arcsec circular ap. mag. smallint 2 CODE_MISC

h_flg_7 twomass_xsc 2MASS H confusion flag for 7 arcsec circular ap. mag. smallint 2 CODE_MISC

h_flg_70 twomass_xsc 2MASS H confusion flag for 70 arcsec circular ap. mag. smallint 2 CODE_MISC

h_flg_c twomass_xsc 2MASS H confusion flag for Kron circular mag. smallint 2 CODE_MISC

h_flg_e twomass_xsc 2MASS H confusion flag for Kron elliptical mag. smallint 2 CODE_MISC

h_flg_fc twomass_xsc 2MASS H confusion flag for fiducial Kron circ. mag. smallint 2 CODE_MISC

h_flg_fe twomass_xsc 2MASS H confusion flag for fiducial Kron ell. mag. smallint 2 CODE_MISC

h_flg_i20c twomass_xsc 2MASS H confusion flag for 20mag/sq." iso. circ. mag. smallint 2 CODE_MISC

h_flg_i20e twomass_xsc 2MASS H confusion flag for 20mag/sq." iso. ell. mag. smallint 2 CODE_MISC

h_flg_i21c twomass_xsc 2MASS H confusion flag for 21mag/sq." iso. circ. mag. smallint 2 CODE_MISC

h_flg_i21e twomass_xsc 2MASS H confusion flag for 21mag/sq." iso. ell. mag. smallint 2 CODE_MISC

h_flg_j21fc twomass_xsc 2MASS H confusion flag for 21mag/sq." iso. fid. circ. mag. smallint 2 CODE_MISC

h_flg_j21fe twomass_xsc 2MASS H confusion flag for 21mag/sq." iso. fid. ell. mag. smallint 2 CODE_MISC

h_flg_k20fc twomass_xsc 2MASS H confusion flag for 20mag/sq." iso. fid. circ. mag. smallint 2 CODE_MISC

h_flg_k20fe twomass_xsc 2MASS H confusion flag for 20mag/sq." iso. fid. ell. mag. smallint 2 CODE_MISC

h_m twomass_psc 2MASS Default H-band magnitude real 4 mag SPECT_FLUX_VALUE

h_m_10 twomass_xsc 2MASS H 10 arcsec radius circular aperture magnitude. real 4 mag SPECT_FLUX_VALUE

h_m_15 twomass_xsc 2MASS H 15 arcsec radius circular aperture magnitude. real 4 mag SPECT_FLUX_VALUE

h_m_20 twomass_xsc 2MASS H 20 arcsec radius circular aperture magnitude. real 4 mag SPECT_FLUX_VALUE

h_m_25 twomass_xsc 2MASS H 25 arcsec radius circular aperture magnitude. real 4 mag SPECT_FLUX_VALUE

h_m_30 twomass_xsc 2MASS H 30 arcsec radius circular aperture magnitude. real 4 mag SPECT_FLUX_VALUE

h_m_40 twomass_xsc 2MASS H 40 arcsec radius circular aperture magnitude. real 4 mag SPECT_FLUX_VALUE

h_m_5 twomass_xsc 2MASS H 5 arcsec radius circular aperture magnitude. real 4 mag SPECT_FLUX_VALUE

h_m_50 twomass_xsc 2MASS H 50 arcsec radius circular aperture magnitude. real 4 mag SPECT_FLUX_VALUE

h_m_60 twomass_xsc 2MASS H 60 arcsec radius circular aperture magnitude. real 4 mag SPECT_FLUX_VALUE

h_m_7 twomass_xsc 2MASS H 7 arcsec radius circular aperture magnitude. real 4 mag SPECT_FLUX_VALUE

h_m_70 twomass_xsc 2MASS H 70 arcsec radius circular aperture magnitude. real 4 mag SPECT_FLUX_VALUE

h_m_c twomass_xsc 2MASS H Kron circular aperture magnitude. real 4 mag SPECT_FLUX_VALUE

h_m_e twomass_xsc 2MASS H Kron elliptical aperture magnitude. real 4 mag SPECT_FLUX_VALUE

h_m_ext twomass_xsc 2MASS H mag from fit extrapolation. real 4 mag SPECT_FLUX_VALUE

h_m_fc twomass_xsc 2MASS H fiducial Kron circular magnitude. real 4 mag SPECT_FLUX_VALUE

h_m_fe twomass_xsc 2MASS H fiducial Kron ell. mag aperture magnitude. real 4 mag SPECT_FLUX_VALUE

h_m_i20c twomass_xsc 2MASS H 20mag/sq." isophotal circular ap. magnitude. real 4 mag SPECT_FLUX_VALUE

h_m_i20e twomass_xsc 2MASS H 20mag/sq." isophotal elliptical ap. magnitude. real 4 mag SPECT_FLUX_VALUE

h_m_i21c twomass_xsc 2MASS H 21mag/sq." isophotal circular ap. magnitude. real 4 mag SPECT_FLUX_VALUE

h_m_i21e twomass_xsc 2MASS H 21mag/sq." isophotal elliptical ap. magnitude. real 4 mag SPECT_FLUX_VALUE

h_m_j21fc twomass_xsc 2MASS H 21mag/sq." isophotal fiducial circ. ap. mag. real 4 mag SPECT_FLUX_VALUE

h_m_j21fe twomass_xsc 2MASS H 21mag/sq." isophotal fiducial ell. ap. magnitude. real 4 mag SPECT_FLUX_VALUE

h_m_k20fc twomass_xsc 2MASS H 20mag/sq." isophotal fiducial circ. ap. mag. real 4 mag SPECT_FLUX_VALUE

h_m_k20fe twomass_xsc 2MASS H 20mag/sq." isophotal fiducial ell. ap. magnitude. real 4 mag SPECT_FLUX_VALUE

h_m_stdap twomass_psc 2MASS H-band "standard" aperture magnitude. real 4 mag SPECT_FLUX_VALUE

h_m_sys twomass_xsc 2MASS H system photometry magnitude. real 4 mag SPECT_FLUX_VALUE

h_mnsurfb_eff twomass_xsc 2MASS H mean surface brightness at the half-light radius. real 4 mag PHOT_SB_GENERAL

h_msig_10 twomass_xsc 2MASS H 1-sigma uncertainty in 10 arcsec circular ap. mag. real 4 mag ERROR

h_msig_15 twomass_xsc 2MASS H 1-sigma uncertainty in 15 arcsec circular ap. mag. real 4 mag ERROR

h_msig_20 twomass_xsc 2MASS H 1-sigma uncertainty in 20 arcsec circular ap. mag. real 4 mag ERROR

h_msig_25 twomass_xsc 2MASS H 1-sigma uncertainty in 25 arcsec circular ap. mag. real 4 mag ERROR

h_msig_30 twomass_xsc 2MASS H 1-sigma uncertainty in 30 arcsec circular ap. mag. real 4 mag ERROR

h_msig_40 twomass_xsc 2MASS H 1-sigma uncertainty in 40 arcsec circular ap. mag. real 4 mag ERROR

h_msig_5 twomass_xsc 2MASS H 1-sigma uncertainty in 5 arcsec circular ap. mag. real 4 mag ERROR

h_msig_50 twomass_xsc 2MASS H 1-sigma uncertainty in 50 arcsec circular ap. mag. real 4 mag ERROR

h_msig_60 twomass_xsc 2MASS H 1-sigma uncertainty in 60 arcsec circular ap. mag. real 4 mag ERROR

h_msig_7 twomass_xsc 2MASS H 1-sigma uncertainty in 7 arcsec circular ap. mag. real 4 mag ERROR

h_msig_70 twomass_xsc 2MASS H 1-sigma uncertainty in 70 arcsec circular ap. mag. real 4 mag ERROR

h_msig_c twomass_xsc 2MASS H 1-sigma uncertainty in Kron circular mag. real 4 mag ERROR

h_msig_e twomass_xsc 2MASS H 1-sigma uncertainty in Kron elliptical mag. real 4 mag ERROR

h_msig_ext twomass_xsc 2MASS H 1-sigma uncertainty in mag from fit extrapolation. real 4 mag ERROR

h_msig_fc twomass_xsc 2MASS H 1-sigma uncertainty in fiducial Kron circ. mag. real 4 mag ERROR

h_msig_fe twomass_xsc 2MASS H 1-sigma uncertainty in fiducial Kron ell. mag. real 4 mag ERROR

h_msig_i20c twomass_xsc 2MASS H 1-sigma uncertainty in 20mag/sq." iso. circ. mag. real 4 mag ERROR

h_msig_i20e twomass_xsc 2MASS H 1-sigma uncertainty in 20mag/sq." iso. ell. mag. real 4 mag ERROR

h_msig_i21c twomass_xsc 2MASS H 1-sigma uncertainty in 21mag/sq." iso. circ. mag. real 4 mag ERROR

h_msig_i21e twomass_xsc 2MASS H 1-sigma uncertainty in 21mag/sq." iso. ell. mag. real 4 mag ERROR

h_msig_j21fc twomass_xsc 2MASS H 1-sigma uncertainty in 21mag/sq." iso.fid.circ.mag. real 4 mag ERROR

h_msig_j21fe twomass_xsc 2MASS H 1-sigma uncertainty in 21mag/sq." iso.fid.ell.mag. real 4 mag ERROR

h_msig_k20fc twomass_xsc 2MASS H 1-sigma uncertainty in 20mag/sq." iso.fid.circ. mag. real 4 mag ERROR

h_msig_k20fe twomass_xsc 2MASS H 1-sigma uncertainty in 20mag/sq." iso.fid.ell.mag. real 4 mag ERROR

h_msig_stdap twomass_psc 2MASS Uncertainty in the H-band standard aperture magnitude. real 4 mag SPECT_FLUX_VALUE

h_msig_sys twomass_xsc 2MASS H 1-sigma uncertainty in system photometry mag. real 4 mag ERROR

h_msigcom twomass_psc 2MASS Combined, or total photometric uncertainty for the default H-band magnitude. real 4 mag SPECT_FLUX_VALUE

h_msnr10 twomass_scn 2MASS The estimated H-band magnitude at which SNR=10 is achieved for this scan. real 4 mag SPECT_FLUX_VALUE

h_n_snr10 twomass_scn 2MASS Number of point sources at H-band with SNR>10 (instrumental mag <=15.1) int 4 NUMBER

h_pchi twomass_xsc 2MASS H chi^2 of fit to rad. profile (LCSB: alpha scale len). real 4 FIT_PARAM_VALUE

h_peak twomass_xsc 2MASS H peak pixel brightness. real 4 mag PHOT_SB_GENERAL

h_perc_darea twomass_xsc 2MASS H 5-sigma to 3-sigma percent area change. smallint 2 FIT_PARAM

h_phi twomass_xsc 2MASS H angle to 3-sigma major axis (E of N). smallint 2 degrees POS_POS-ANG

h_psfchi twomass_psc 2MASS Reduced chi-squared goodness-of-fit value for the H-band profile-fit photometry made on the 1.3 s "Read_2" exposures. real 4 FIT_PARAM_VALUE

h_psp twomass_scn 2MASS H-band photometric sensitivity paramater (PSP). real 4 INST_SENSITIVITY

h_pts_noise twomass_scn 2MASS Base-10 logarithm of the mode of the noise distribution for all point source detections in the scan, where the noise is estimated from the measured H-band photometric errors and is expressed in units of mJy. real 4 INST_NOISE

h_r_c twomass_xsc 2MASS H Kron circular aperture radius. real 4 arcsec EXTENSION_RAD

h_r_e twomass_xsc 2MASS H Kron elliptical aperture semi-major axis. real 4 arcsec EXTENSION_RAD

h_r_eff twomass_xsc 2MASS H half-light (integrated half-flux point) radius. real 4 arcsec EXTENSION_RAD

h_r_i20c twomass_xsc 2MASS H 20mag/sq." isophotal circular aperture radius. real 4 arcsec EXTENSION_RAD

h_r_i20e twomass_xsc 2MASS H 20mag/sq." isophotal elliptical ap. semi-major axis. real 4 arcsec EXTENSION_RAD

h_r_i21c twomass_xsc 2MASS H 21mag/sq." isophotal circular aperture radius. real 4 arcsec EXTENSION_RAD

h_r_i21e twomass_xsc 2MASS H 21mag/sq." isophotal elliptical ap. semi-major axis. real 4 arcsec EXTENSION_RAD

h_resid_ann twomass_xsc 2MASS H residual annulus background median. real 4 DN CODE_MISC

h_sc_1mm twomass_xsc 2MASS H 1st moment (score) (LCSB: super blk 2,4,8 SNR). real 4 CODE_MISC

h_sc_2mm twomass_xsc 2MASS H 2nd moment (score) (LCSB: SNRMAX - super SNR max). real 4 CODE_MISC

h_sc_msh twomass_xsc 2MASS H median shape score. real 4 CODE_MISC

h_sc_mxdn twomass_xsc 2MASS H mxdn (score) (LCSB: BSNR - block/smoothed SNR). real 4 CODE_MISC

h_sc_r1 twomass_xsc 2MASS H r1 (score). real 4 CODE_MISC

h_sc_r23 twomass_xsc 2MASS H r23 (score) (LCSB: TSNR - integrated SNR for r=15). real 4 CODE_MISC

h_sc_sh twomass_xsc 2MASS H shape (score). real 4 CODE_MISC

h_sc_vint twomass_xsc 2MASS H vint (score). real 4 CODE_MISC

h_sc_wsh twomass_xsc 2MASS H wsh (score) (LCSB: PSNR - peak raw SNR). real 4 CODE_MISC

h_seetrack twomass_xsc 2MASS H band seetracking score. real 4 CODE_MISC

h_sh0 twomass_xsc 2MASS H ridge shape (LCSB: BSNR limit). real 4 FIT_PARAM

h_shape_avg twomass_scn 2MASS H-band average seeing shape for scan. real 4 INST_SEEING

h_shape_rms twomass_scn 2MASS RMS-error of H-band average seeing shape. real 4 INST_SEEING

h_sig_sh0 twomass_xsc 2MASS H ridge shape sigma (LCSB: B2SNR limit). real 4 FIT_PARAM

h_snr twomass_psc 2MASS H-band "scan" signal-to-noise ratio. real 4 mag INST_NOISE

h_subst2 twomass_xsc 2MASS H residual background #2 (score). real 4 CODE_MISC

h_zp_ap twomass_scn 2MASS Photometric zero-point for H-band aperture photometry. real 4 mag PHOT_ZP

h_zperr_ap twomass_scn 2MASS RMS-error of zero-point for H-band aperture photometry real 4 mag FIT_ERROR

ha twomass_scn 2MASS Hour angle at beginning of scan. float 8 hr POS_POS-ANG

hallFlux UKIDSSDetection WSA flux within circular aperture to k × r_h; k = 5; alternative total flux real 4 ADU PHOT_INTENSITY_ADU

hallFlux dxsDetection, dxsListRemeasurement, gcsDetection, gcsListRemeasurement, gpsDetection, gpsListRemeasurement, lasDetection, lasListRemeasurement, udsListRemeasurement WSA flux within circular aperture to k × r_h; k = 5; alternative total flux {catalogue TType keyword: Hall_flux} real 4 ADU PHOT_INTENSITY_ADU

hallFlux ptsDetection WSATransit flux within circular aperture to k × r_h; k = 5; alternative total flux {catalogue TType keyword: Hall_flux} real 4 ADU PHOT_INTENSITY_ADU

hallFlux udsDetection WSA Not available in SE output {catalogue TType keyword: Hall_flux} real 4 -0.9999995e9

hallFluxErr UKIDSSDetection WSA error on Hall flux real 4 ADU ERROR

hallFluxErr dxsDetection, dxsListRemeasurement, gcsDetection, gcsListRemeasurement, gpsDetection, gpsListRemeasurement, lasDetection, lasListRemeasurement, udsListRemeasurement WSA error on Hall flux {catalogue TType keyword: Hall_flux_err} real 4 ADU ERROR

hallFluxErr ptsDetection WSATransit error on Hall flux {catalogue TType keyword: Hall_flux_err} real 4 ADU ERROR

hallFluxErr udsDetection WSA Not available in SE output {catalogue TType keyword: Hall_flux_err} real 4 -0.9999995e9

hallMag dxsDetection, dxsListRemeasurement, gcsDetection, gcsListRemeasurement, gpsDetection, gpsListRemeasurement, lasDetection, lasListRemeasurement, UKIDSSDetection, udsListRemeasurement WSA Calibrated magnitude within circular aperture r_hall real 4 mag PHOT_INT-MAG

hallMag ptsDetection WSATransit Calibrated magnitude within circular aperture r_hall real 4 mag PHOT_INT-MAG

hallMag udsDetection WSA Not available in SE output real 4 -0.9999995e9

hallMagErr dxsDetection, dxsListRemeasurement, gcsDetection, gcsListRemeasurement, gpsDetection, gpsListRemeasurement, lasDetection, lasListRemeasurement, UKIDSSDetection, udsListRemeasurement WSA Calibrated error on Hall magnitude real 4 mag ERROR

hallMagErr ptsDetection WSATransit Calibrated error on Hall magnitude real 4 mag ERROR

hallMagErr udsDetection WSA Not available in SE output real 4 -0.9999995e9

hallRad UKIDSSDetection WSA r_h image scale radius eg. Hall & Mackay 1984 MNRAS 210 979 real 4 pixels EXTENSION_RAD

hallRad dxsDetection, dxsListRemeasurement, gcsDetection, gcsListRemeasurement, gpsDetection, gpsListRemeasurement, lasDetection, lasListRemeasurement, udsListRemeasurement WSA r_h image scale radius eg. Hall & Mackay 1984 MNRAS 210 979 {catalogue TType keyword: Hall_radius} real 4 pixels EXTENSION_RAD

hallRad ptsDetection WSATransit r_h image scale radius eg. Hall & Mackay 1984 MNRAS 210 979 {catalogue TType keyword: Hall_radius} real 4 pixels EXTENSION_RAD

hallRad udsDetection WSA Not available in SE output {catalogue TType keyword: Hall_radius} real 4 -0.9999995e9

haloRadius JunkDetection SSA Vertical half-major axis of halo ellipse real 4 arcsec 0.0 EXTENSION_RAD

hAperMag3 dxsJKsource, gcsPointSource, gcsZYJHKsource, gpsJHKsource, gpsPointSource, lasExtendedSource, lasPointSource, lasYJHKsource, reliableDxsSource, reliableGcsPointSource, reliableGpsPointSource, reliableLasPointSource WSA Default point/extended source H aperture corrected mag (2.0 arcsec aperture diameter) real 4 mag -0.9999995e9 PHOT_MAG

hAperMag3 dxsSource, gcsSource, gpsSource, lasSource WSA Default point/extended source H aperture corrected mag (2.0 arcsec aperture diameter)
If in doubt use this flux estimator real 4 mag -0.9999995e9 PHOT_MAG

hAperMag3 udsSource WSA Default point/extended source H mag, no aperture correction applied
If in doubt use this flux estimator real 4 mag -0.9999995e9 PHOT_MAG

hAperMag3Err dxsJKsource, dxsSource, gcsPointSource, gcsSource, gcsZYJHKsource, gpsJHKsource, gpsPointSource, gpsSource, lasExtendedSource, lasPointSource, lasSource, lasYJHKsource, reliableDxsSource, reliableGcsPointSource, reliableGpsPointSource, reliableLasPointSource, udsSource WSA Error in default point/extended source H mag (2.0 arcsec aperture diameter) real 4 mag -0.9999995e9 ERROR

hAperMag4 dxsJKsource, dxsSource, gcsPointSource, gcsSource, gcsZYJHKsource, gpsJHKsource, gpsPointSource, gpsSource, lasExtendedSource, lasPointSource, lasSource, lasYJHKsource, reliableDxsSource, reliableGcsPointSource, reliableGpsPointSource, reliableLasPointSource WSA Extended source H aperture corrected mag (2.8 arcsec aperture diameter) real 4 mag -0.9999995e9 PHOT_MAG

hAperMag4 udsSource WSA Extended source H mag, no aperture correction applied real 4 mag -0.9999995e9 PHOT_MAG

hAperMag4Err dxsJKsource, dxsSource, gcsPointSource, gcsSource, gcsZYJHKsource, gpsJHKsource, gpsPointSource, gpsSource, lasExtendedSource, lasPointSource, lasSource, lasYJHKsource, reliableDxsSource, reliableGcsPointSource, reliableGpsPointSource, reliableLasPointSource, udsSource WSA Error in extended source H mag (2.8 arcsec aperture diameter) real 4 mag -0.9999995e9 ERROR

hAperMag6 dxsJKsource, dxsSource, gcsPointSource, gcsSource, gcsZYJHKsource, gpsJHKsource, gpsPointSource, gpsSource, lasExtendedSource, lasPointSource, lasSource, lasYJHKsource, reliableDxsSource, reliableGcsPointSource, reliableGpsPointSource, reliableLasPointSource WSA Extended source H aperture corrected mag (5.7 arcsec aperture diameter) real 4 mag -0.9999995e9 PHOT_MAG

hAperMag6 udsSource WSA Extended source H mag, no aperture correction applied real 4 mag -0.9999995e9 PHOT_MAG

hAperMag6Err dxsJKsource, dxsSource, gcsPointSource, gcsSource, gcsZYJHKsource, gpsJHKsource, gpsPointSource, gpsSource, lasExtendedSource, lasPointSource, lasSource, lasYJHKsource, reliableDxsSource, reliableGcsPointSource, reliableGpsPointSource, reliableLasPointSource, udsSource WSA Error in extended source H mag (5.7 arcsec aperture diameter) real 4 mag -0.9999995e9 ERROR

hClass dxsJKsource, dxsSource, dxsSourceRemeasurement, gcsPointSource, gcsSource, gcsSourceRemeasurement, gcsZYJHKsource, gpsJHKsource, gpsPointSource, gpsSource, gpsSourceRemeasurement, lasExtendedSource, lasPointSource, lasSource, lasSourceRemeasurement, lasYJHKsource, reliableDxsSource, reliableGcsPointSource, reliableGpsPointSource, reliableLasPointSource, udsSource, udsSourceRemeasurement WSA discrete image classification flag in H smallint 2 -9999 CLASS_MISC

hClassStat dxsJKsource, dxsSource, dxsSourceRemeasurement, gcsPointSource, gcsSource, gcsSourceRemeasurement, gcsZYJHKsource, gpsJHKsource, gpsPointSource, gpsSource, gpsSourceRemeasurement, lasExtendedSource, lasPointSource, lasSource, lasSourceRemeasurement, lasYJHKsource, reliableDxsSource, reliableGcsPointSource, reliableGpsPointSource, reliableLasPointSource, udsSourceRemeasurement WSA N(0,1) stellarness-of-profile statistic in H real 4 -0.9999995e9 STAT_PROP

hClassStat udsSource WSA S-Extractor classification statistic in H real 4 -0.9999995e9 STAT_PROP

hDeblend dxsJKsource, dxsSource, dxsSourceRemeasurement, gcsPointSource, gcsSource, gcsSourceRemeasurement, gcsZYJHKsource, gpsJHKsource, gpsPointSource, gpsSource, gpsSourceRemeasurement, lasExtendedSource, lasPointSource, lasSource, lasSourceRemeasurement, lasYJHKsource, reliableDxsSource, reliableGcsPointSource, reliableGpsPointSource, reliableLasPointSource, udsSource, udsSourceRemeasurement WSA flag indicating parent/child relation in H int 4 -99999999 CODE_MISC

hdtFile Multiframe WSA Name of global hdt file {image primary HDU keyword: HDTFILE} varchar 32 NONE

hdtFile Multiframe WSATransit Name of global hdt file {image primary HDU keyword: HDTFILE} varchar 32 NONE

hdtFileExt MultiframeDetector WSA Name of camera-specific hdt file {image extension keyword: HDTFILE2} varchar 32 NONE ??

hdtFileExt MultiframeDetector WSATransit Name of camera-specific hdt file {image extension keyword: HDTFILE2} varchar 32 NONE ??

hEll dxsJKsource, dxsSource, dxsSourceRemeasurement, gcsPointSource, gcsSource, gcsSourceRemeasurement, gcsZYJHKsource, gpsJHKsource, gpsPointSource, gpsSource, gpsSourceRemeasurement, lasExtendedSource, lasPointSource, lasSource, lasSourceRemeasurement, lasYJHKsource, reliableDxsSource, reliableGcsPointSource, reliableGpsPointSource, reliableLasPointSource, udsSource, udsSourceRemeasurement WSA 1-b/a, where a/b=semi-major/minor axes in H real 4 -0.9999995e9 PHYS_ELLIPTICITY

hemis twomass_psc 2MASS Hemisphere code for the TWOMASS Observatory from which this source was observed. varchar 1 OBS_CODE

hemis twomass_scn 2MASS Observatory from which data were obtained: "n" = north = Mt. Hopkins, "s" = south = Cerro Tololo. varchar 1 OBS_CODE

hemis twomass_xsc 2MASS hemisphere (N/S) of observation. "n" = North/Mt. Hopkins; "s" = South/CTIO. varchar 1 OBS_CODE

heNum dxsJKmergeLog, dxsMergeLog, gcsMergeLog, gcsZYJHKmergeLog, gpsJHKmergeLog, gpsMergeLog, lasMergeLog, lasYJHKmergeLog, udsMergeLog WSA the extension number of this H frame tinyint 1 NUMBER

hErrBits dxsJKsource, dxsSourceRemeasurement, gcsPointSource, gcsSourceRemeasurement, gcsZYJHKsource, gpsJHKsource, gpsPointSource, gpsSourceRemeasurement, lasExtendedSource, lasPointSource, lasSourceRemeasurement, lasYJHKsource, reliableDxsSource, reliableGcsPointSource, reliableGpsPointSource, reliableLasPointSource, udsSourceRemeasurement WSA processing warning/error bitwise flags in H int 4 -99999999 CODE_MISC

hErrBits dxsSource, gcsSource, gpsSource, lasSource WSA processing warning/error bitwise flags in H int 4 -99999999 CODE_MISC

Apparently not actually an error bit flag, but a count of the number of zero confidence pixels in the default (2 arcsec diameter) aperture.

hErrBits udsSource WSA processing warning/error bitwise flags in H int 4 -99999999 CODE_MISC

This uses the FLAGS attribute in SE. The individual bit flags that this can be decomposed into are as follows:

Bit Flag Meaning

1 The object has neighbours, bright enough and close enough to significantly bias the MAG_AUTO photometry or bad pixels (more than 10% of photometry affected).

2 The object was originally blended with another

4 At least one pixel is saturated (or very close to)

8 The object is truncated (too close to an image boundary)

16 Object's aperture data are incomplete or corrupted

32 Object's isophotal data are imcomplete or corrupted. This is an old flag inherited from SE v1.0, and is kept for compatability reasons. It doesn't have any consequence for the extracted parameters.

64 Memory overflow occurred during deblending

128 Memory overflow occurred during extraction

hEta dxsJKsource, gcsPointSource, gcsZYJHKsource, gpsJHKsource, gpsPointSource, lasExtendedSource, lasPointSource, lasYJHKsource, reliableDxsSource, reliableGcsPointSource, reliableGpsPointSource, reliableLasPointSource WSA Offset of H detection from master position (+north/-south) real 4 arcsec -0.9999995e9 POS_EQ_DEC_OFF

hEta dxsSource, gcsSource, gpsSource, lasSource, udsSource WSA Offset of H detection from master position (+north/-south) real 4 arcsec -0.9999995e9 POS_EQ_DEC_OFF

When associating individual passband detections into merged sources, a generous (in terms of the positional uncertainties) pairing radius of 2.0 (UKIDSS LAS and GPS; also non-survey programmes) or 1.0 (UKIDSS GPS, DXS and UDS) arcseconds is used, the higher value enabling pairing of moving sources when epoch separations may be several years. Such a large association criterion can of course lead to spurious pairings in the merged sources lists (although note that between passband pairs, handshake pairing is done: both passbands must agree that the candidate pair is their nearest neighbour for the pair to propagate through into the merged source table). In order to help filter spurious pairings out, and assuming that large positional offsets between the different passband detections are not expected (e.g. because of source motion, or larger than usual positional uncertainties) then the attributes Xi and Eta can be used to filter any pairings with suspiciously large offsets in one or more bands. For example, for a clean sample of QSOs from the LAS, you might wish to insist that the offsets in the selected sample are all below 1 arcsecond: simply add WHERE clauses into the SQL sample selection script to exclude all Xi and Eta values larger than the threshold you want.

hGausig dxsJKsource, dxsSource, dxsSourceRemeasurement, gcsPointSource, gcsSource, gcsSourceRemeasurement, gcsZYJHKsource, gpsJHKsource, gpsPointSource, gpsSource, gpsSourceRemeasurement, lasExtendedSource, lasPointSource, lasSource, lasSourceRemeasurement, lasYJHKsource, reliableDxsSource, reliableGcsPointSource, reliableGpsPointSource, reliableLasPointSource, udsSource, udsSourceRemeasurement WSA RMS of axes of ellipse fit in H real 4 pixels -0.9999995e9 MORPH_PARAM

hgl twomass_scn 2MASS Special flag indicating whether or not this scan has a single-frame H-band electronic glitch. smallint 2 CODE_MISC

hHallMag dxsJKsource, dxsSource, gcsPointSource, gcsSource, gcsZYJHKsource, gpsJHKsource, gpsPointSource, gpsSource, lasExtendedSource, lasPointSource, lasSource, lasYJHKsource, reliableDxsSource, reliableGcsPointSource, reliableGpsPointSource, reliableLasPointSource WSA Total point source H mag real 4 mag -0.9999995e9 PHOT_MAG

hHallMag udsSource WSA Not available in SE output real 4 mag -0.9999995e9 PHOT_MAG

hHallMagErr dxsJKsource, dxsSource, gcsPointSource, gcsSource, gcsZYJHKsource, gpsJHKsource, gpsPointSource, gpsSource, lasExtendedSource, lasPointSource, lasSource, lasYJHKsource, reliableDxsSource, reliableGcsPointSource, reliableGpsPointSource, reliableLasPointSource WSA Error in total point source H mag real 4 mag -0.9999995e9 ERROR

hHallMagErr udsSource WSA Not available in SE output real 4 mag -0.9999995e9 ERROR

HLRADIUS mgcBrightSpec MGC Semi-major axis of half-light ellipse real 4 pixel

hMag CurrentStdStarInfo, PreviousStdStarInfo WSA H band total magnitude of star (from external sources if primary) real 4 mag PHOT_INT-MAG

hMag dxsSourceRemeasurement, gcsSourceRemeasurement, gpsSourceRemeasurement, lasSourceRemeasurement, udsSourceRemeasurement WSA H mag (as appropriate for this merged source) real 4 mag -0.9999995e9 PHOT_MAG

hMag ukirtFSstars WSA H band total magnitude on the MKO(UFTI) system real 4 mag PHOT_INT-MAG

hMagErr CurrentStdStarInfo, PreviousStdStarInfo WSA H band magnitude error of star real 4 mag ERROR

hMagErr dxsSourceRemeasurement, gcsSourceRemeasurement, gpsSourceRemeasurement, lasSourceRemeasurement, udsSourceRemeasurement WSA Error in H mag real 4 mag -0.9999995e9 ERROR

hMagErr ukirtFSstars WSA H band magnitude error real 4 mag ERROR

hmfID dxsJKmergeLog, dxsMergeLog, gcsMergeLog, gcsZYJHKmergeLog, gpsJHKmergeLog, gpsMergeLog, lasMergeLog, lasYJHKmergeLog, udsMergeLog WSA the UID of the relevant H multiframe bigint 8 ID_FRAME

hmk dxsSourceRemeasurement, lasSourceRemeasurement, udsSourceRemeasurement WSA Default colour H-K (using appropriate mags) real 4 mag PHOT_COLOR

hmk_1 gcsSourceRemeasurement, gpsSourceRemeasurement WSA Default colour H-K (using appropriate mags) real 4 mag PHOT_COLOR

hmk_1Err gcsSourceRemeasurement, gpsSourceRemeasurement WSA Error on colour H-K real 4 mag ERROR

hmk_1Ext gcsPointSource, gcsZYJHKsource, gpsJHKsource, gpsPointSource, reliableGcsPointSource, reliableGpsPointSource WSA Extended source colour H-K (using aperMag3) real 4 mag -0.9999995e9 PHOT_COLOR

hmk_1Ext gcsSource, gpsSource WSA Extended source colour H-K (using aperMag3) real 4 mag -0.9999995e9 PHOT_COLOR

Default colours from pairs of adjacent passbands within a given set (e.g. Y-J, J-H and H-K for YJHK) are recorded in the merged source table for ease of querying and speedy querying via indexing of these attributes. Presently, the point-source colours and extended source colours are computed from the aperture corrected AperMag3 fixed 2 arcsec aperture diameter measures (for consistent measurement across all passbands) and generally good signal-to-noise. At some point in the future, this may be changed such that point-source colours will be computed from the PSF-fitted measures and extended source colours computed from the 2-d Sersic model profile fits.

hmk_1ExtErr gcsPointSource, gcsZYJHKsource, gpsJHKsource, gpsPointSource, reliableGcsPointSource, reliableGpsPointSource WSA Error on extended source colour H-K real 4 mag -0.9999995e9 ERROR

hmk_1ExtErr gcsSource, gpsSource WSA Error on extended source colour H-K real 4 mag -0.9999995e9 ERROR

Default colours from pairs of adjacent passbands within a given set (e.g. Y-J, J-H and H-K for YJHK) are recorded in the merged source table for ease of querying and speedy querying via indexing of these attributes. Presently, the point-source colours and extended source colours are computed from the aperture corrected AperMag3 fixed 2 arcsec aperture diameter measures (for consistent measurement across all passbands) and generally good signal-to-noise. At some point in the future, this may be changed such that point-source colours will be computed from the PSF-fitted measures and extended source colours computed from the 2-d Sersic model profile fits.

hmk_1Pnt gcsPointSource, gcsZYJHKsource, gpsJHKsource, gpsPointSource, reliableGcsPointSource, reliableGpsPointSource WSA Point source colour H-K (using aperMag3) real 4 mag -0.9999995e9 PHOT_COLOR

hmk_1Pnt gcsSource, gpsSource WSA Point source colour H-K (using aperMag3) real 4 mag -0.9999995e9 PHOT_COLOR

Default colours from pairs of adjacent passbands within a given set (e.g. Y-J, J-H and H-K for YJHK) are recorded in the merged source table for ease of querying and speedy querying via indexing of these attributes. Presently, the point-source colours and extended source colours are computed from the aperture corrected AperMag3 fixed 2 arcsec aperture diameter measures (for consistent measurement across all passbands) and generally good signal-to-noise. At some point in the future, this may be changed such that point-source colours will be computed from the PSF-fitted measures and extended source colours computed from the 2-d Sersic model profile fits.

hmk_1PntErr gcsPointSource, gcsZYJHKsource, gpsJHKsource, gpsPointSource, reliableGcsPointSource, reliableGpsPointSource WSA Error on point source colour H-K real 4 mag -0.9999995e9 ERROR

hmk_1PntErr gcsSource, gpsSource WSA Error on point source colour H-K real 4 mag -0.9999995e9 ERROR

Default colours from pairs of adjacent passbands within a given set (e.g. Y-J, J-H and H-K for YJHK) are recorded in the merged source table for ease of querying and speedy querying via indexing of these attributes. Presently, the point-source colours and extended source colours are computed from the aperture corrected AperMag3 fixed 2 arcsec aperture diameter measures (for consistent measurement across all passbands) and generally good signal-to-noise. At some point in the future, this may be changed such that point-source colours will be computed from the PSF-fitted measures and extended source colours computed from the 2-d Sersic model profile fits.

hmkErr dxsSourceRemeasurement, lasSourceRemeasurement, udsSourceRemeasurement WSA Error on colour H-K real 4 mag ERROR

hmkExt dxsJKsource, lasExtendedSource, lasPointSource, lasYJHKsource, reliableDxsSource, reliableLasPointSource WSA Extended source colour H-K (using aperMag3) real 4 mag -0.9999995e9 PHOT_COLOR

hmkExt dxsSource, lasSource, udsSource WSA Extended source colour H-K (using aperMag3) real 4 mag -0.9999995e9 PHOT_COLOR

Default colours from pairs of adjacent passbands within a given set (e.g. Y-J, J-H and H-K for YJHK) are recorded in the merged source table for ease of querying and speedy querying via indexing of these attributes. Presently, the point-source colours and extended source colours are computed from the aperture corrected AperMag3 fixed 2 arcsec aperture diameter measures (for consistent measurement across all passbands) and generally good signal-to-noise. At some point in the future, this may be changed such that point-source colours will be computed from the PSF-fitted measures and extended source colours computed from the 2-d Sersic model profile fits.

hmkExtErr dxsJKsource, lasExtendedSource, lasPointSource, lasYJHKsource, reliableDxsSource, reliableLasPointSource WSA Error on extended source colour H-K real 4 mag -0.9999995e9 ERROR

hmkExtErr dxsSource, lasSource, udsSource WSA Error on extended source colour H-K real 4 mag -0.9999995e9 ERROR

Default colours from pairs of adjacent passbands within a given set (e.g. Y-J, J-H and H-K for YJHK) are recorded in the merged source table for ease of querying and speedy querying via indexing of these attributes. Presently, the point-source colours and extended source colours are computed from the aperture corrected AperMag3 fixed 2 arcsec aperture diameter measures (for consistent measurement across all passbands) and generally good signal-to-noise. At some point in the future, this may be changed such that point-source colours will be computed from the PSF-fitted measures and extended source colours computed from the 2-d Sersic model profile fits.

hmkPnt dxsJKsource, lasExtendedSource, lasPointSource, lasYJHKsource, reliableDxsSource, reliableLasPointSource WSA Point source colour H-K (using aperMag3) real 4 mag -0.9999995e9 PHOT_COLOR

hmkPnt dxsSource, lasSource, udsSource WSA Point source colour H-K (using aperMag3) real 4 mag -0.9999995e9 PHOT_COLOR

Default colours from pairs of adjacent passbands within a given set (e.g. Y-J, J-H and H-K for YJHK) are recorded in the merged source table for ease of querying and speedy querying via indexing of these attributes. Presently, the point-source colours and extended source colours are computed from the aperture corrected AperMag3 fixed 2 arcsec aperture diameter measures (for consistent measurement across all passbands) and generally good signal-to-noise. At some point in the future, this may be changed such that point-source colours will be computed from the PSF-fitted measures and extended source colours computed from the 2-d Sersic model profile fits.

hmkPntErr dxsJKsource, lasExtendedSource, lasPointSource, lasYJHKsource, reliableDxsSource, reliableLasPointSource WSA Error on point source colour H-K real 4 mag -0.9999995e9 ERROR

hmkPntErr dxsSource, lasSource, udsSource WSA Error on point source colour H-K real 4 mag -0.9999995e9 ERROR

Default colours from pairs of adjacent passbands within a given set (e.g. Y-J, J-H and H-K for YJHK) are recorded in the merged source table for ease of querying and speedy querying via indexing of these attributes. Presently, the point-source colours and extended source colours are computed from the aperture corrected AperMag3 fixed 2 arcsec aperture diameter measures (for consistent measurement across all passbands) and generally good signal-to-noise. At some point in the future, this may be changed such that point-source colours will be computed from the PSF-fitted measures and extended source colours computed from the 2-d Sersic model profile fits.

hObjID dxsJKsource, dxsSource, gcsPointSource, gcsSource, gcsZYJHKsource, gpsJHKsource, gpsPointSource, gpsSource, lasExtendedSource, lasPointSource, lasSource, lasYJHKsource, reliableDxsSource, reliableGcsPointSource, reliableGpsPointSource, reliableLasPointSource, udsSource WSA the UID of the H detection bigint 8 -99999999 ID_NUMBER

hObjID dxsSourceRemeasurement, gcsSourceRemeasurement, gpsSourceRemeasurement, lasSourceRemeasurement, udsSourceRemeasurement WSA the UID of the H remeasurement bigint 8 -99999999 ID_NUMBER

hourAngle Multiframe WSA Hour angle {image primary HDU keyword: HABASE} real 4 degrees -0.9999995e9

hourAngle Multiframe WSATransit Hour angle {image primary HDU keyword: HABASE} real 4 degrees -0.9999995e9

hPA dxsJKsource, dxsSource, dxsSourceRemeasurement, gcsPointSource, gcsSource, gcsSourceRemeasurement, gcsZYJHKsource, gpsJHKsource, gpsPointSource, gpsSource, gpsSourceRemeasurement, lasExtendedSource, lasPointSource, lasSource, lasSourceRemeasurement, lasYJHKsource, reliableDxsSource, reliableGcsPointSource, reliableGpsPointSource, reliableLasPointSource, udsSource, udsSourceRemeasurement WSA ellipse fit celestial orientation in H real 4 Degrees -0.9999995e9 POS_POS-ANG

hPetroMag dxsJKsource, dxsSource, gcsPointSource, gcsSource, gcsZYJHKsource, gpsJHKsource, gpsPointSource, gpsSource, lasExtendedSource, lasPointSource, lasSource, lasYJHKsource, reliableDxsSource, reliableGcsPointSource, reliableGpsPointSource, reliableLasPointSource, udsSource WSA Extended source H mag (Petrosian) real 4 mag -0.9999995e9 PHOT_MAG

hPetroMagErr dxsJKsource, dxsSource, gcsPointSource, gcsSource, gcsZYJHKsource, gpsJHKsource, gpsPointSource, gpsSource, lasExtendedSource, lasPointSource, lasSource, lasYJHKsource, reliableDxsSource, reliableGcsPointSource, reliableGpsPointSource, reliableLasPointSource, udsSource WSA Error in extended source H mag (Petrosian) real 4 mag -0.9999995e9 ERROR

hppErrBits dxsJKsource, dxsSourceRemeasurement, gcsPointSource, gcsSourceRemeasurement, gcsZYJHKsource, gpsJHKsource, gpsPointSource, gpsSourceRemeasurement, lasExtendedSource, lasPointSource, lasSourceRemeasurement, lasYJHKsource, reliableDxsSource, reliableGcsPointSource, reliableGpsPointSource, reliableLasPointSource, udsSource, udsSourceRemeasurement WSA additional WFAU post-processing error bits in H int 4 0 CODE_MISC

hppErrBits dxsSource, gcsSource, gpsSource, lasSource WSA additional WFAU post-processing error bits in H int 4 0 CODE_MISC

Post-processing error quality bit flags assigned (NB: from UKIDSS DR2 release onwards) in the WSA curation procedure for survey data. From least to most significant byte in the 4-byte integer attribute byte 0 (bits 0 to 7) corresponds to information on generally innocuous conditions that are nonetheless potentially significant as regards the integrity of that detection; byte 1 (bits 8 to 15) corresponds to warnings; byte 2 (bits 16 to 23) corresponds to important warnings; and finally byte 3 (bits 24 to 31) corresponds to severe warnings:

Byte Bit Detection quality issue Threshold or bit mask Applies to

Decimal Hexadecimal

0 4 Deblended 16 0x00000010 LAS, GCS, GPS, DXS

0 6 Bad pixel(s) in default aperture 64 0x00000040 LAS, GCS, GPS, DXS

2 16 Close to saturated 65536 0x00010000 LAS, GCS, GPS

2 19 Possible crosstalk artefact/contamination 524288 0x00080000 LAS, GCS, DXS

2 22 Lies within a dither offset of the stacked frame boundary 4194304 0x00400000 LAS, GCS, GPS, DXS

In this way, the higher the error quality bit flag value, the more likely it is that the detection is spurious. The decimal threshold (column 4) gives the minimum value of the quality flag for a detection having the given condition (since other bits in the flag may be set also; the corresponding hexadecimal value, where each digit corresponds to 4 bits in the flag, can be easier to compute when writing SQL queries to test for a given condition). For example, to exclude all K band sources in the LAS having any error quality condition other than informational ones, include a predicate ... AND kppErrBits ≤ 255. See the SQL Cookbook and other online pages for further information.

hPsfMag dxsJKsource, dxsSource, gcsPointSource, gcsSource, gcsZYJHKsource, gpsJHKsource, gpsPointSource, gpsSource, lasExtendedSource, lasPointSource, lasSource, lasYJHKsource, reliableDxsSource, reliableGcsPointSource, reliableGpsPointSource, reliableLasPointSource WSA Point source profile-fitted H mag real 4 mag -0.9999995e9 PHOT_MAG

hPsfMag udsSource WSA Not available in SE output real 4 mag -0.9999995e9 PHOT_MAG

hPsfMagErr dxsJKsource, dxsSource, gcsPointSource, gcsSource, gcsZYJHKsource, gpsJHKsource, gpsPointSource, gpsSource, lasExtendedSource, lasPointSource, lasSource, lasYJHKsource, reliableDxsSource, reliableGcsPointSource, reliableGpsPointSource, reliableLasPointSource WSA Error in point source profile-fitted H mag real 4 mag -0.9999995e9 ERROR

hPsfMagErr udsSource WSA Not available in SE output real 4 mag -0.9999995e9 ERROR

hr1 rosat_bsc, rosat_fsc ROSAT hardness ratio 1 float 8 SPECT_HARDNESS-RATIO

hr2 rosat_bsc, rosat_fsc ROSAT hardness ratio 2 float 8 SPECT_HARDNESS-RATIO

hry twomass_scn 2MASS Flag indicating the H-band array configuration for the camera. smallint 2 CODE_MISC

hsdFlag_100 iras_psc IRAS Source is located in high source density bin (100 micron). tinyint 1 REMARKS

hsdFlag_12 iras_psc IRAS Source is located in high source density bin (12 micron). tinyint 1 REMARKS

hsdFlag_25 iras_psc IRAS Source is located in high source density bin (25 micron). tinyint 1 REMARKS

hsdFlag_60 iras_psc IRAS Source is located in high source density bin (60 micron). tinyint 1 REMARKS

hSeqNum dxsJKsource, dxsSource, gcsPointSource, gcsSource, gcsZYJHKsource, gpsJHKsource, gpsPointSource, gpsSource, lasExtendedSource, lasPointSource, lasSource, lasYJHKsource, reliableDxsSource, reliableGcsPointSource, reliableGpsPointSource, reliableLasPointSource, udsSource WSA the running number of the H detection int 4 -99999999 ID_NUMBER

hSeqNum dxsSourceRemeasurement, gcsSourceRemeasurement, gpsSourceRemeasurement, lasSourceRemeasurement, udsSourceRemeasurement WSA the running number of the H remeasurement int 4 -99999999 ID_NUMBER

hSerMag2D dxsJKsource, dxsSource, gcsPointSource, gcsSource, gcsZYJHKsource, gpsJHKsource, gpsPointSource, gpsSource, lasExtendedSource, lasPointSource, lasSource, lasYJHKsource, reliableDxsSource, reliableGcsPointSource, reliableGpsPointSource, reliableLasPointSource WSA Extended source H mag (profile-fitted) real 4 mag -0.9999995e9 PHOT_MAG

hSerMag2D udsSource WSA Not available in SE output real 4 mag -0.9999995e9 PHOT_MAG

hSerMag2DErr dxsJKsource, dxsSource, gcsPointSource, gcsSource, gcsZYJHKsource, gpsJHKsource, gpsPointSource, gpsSource, lasExtendedSource, lasPointSource, lasSource, lasYJHKsource, reliableDxsSource, reliableGcsPointSource, reliableGpsPointSource, reliableLasPointSource WSA Error in extended source H mag (profile-fitted) real 4 mag -0.9999995e9 ERROR

hSerMag2DErr udsSource WSA Not available in SE output real 4 mag -0.9999995e9 ERROR

htmID CurrentAstrometry WSA Hierarchical Triangular Mesh (HTM) index, 20 deep, for equatorial co-ordinates of device centre bigint 8 -99999999 POS_GENERAL

htmID CurrentAstrometry WSATransit Hierarchical Triangular Mesh (HTM) index, 20 deep, for equatorial co-ordinates of device centre bigint 8 -99999999 POS_GENERAL

htmID CurrentStdStarInfo, dxsDetection, dxsJKmergeLog, dxsJKsource, dxsListRemeasurement, dxsMergeLog, dxsSource, dxsSourceRemeasurement, gcsDetection, gcsListRemeasurement, gcsMergeLog, gcsPointSource, gcsSource, gcsSourceRemeasurement, gcsZYJHKmergeLog, gcsZYJHKsource, gpsDetection, gpsJHKmergeLog, gpsJHKsource, gpsListRemeasurement, gpsMergeLog, gpsPointSource, gpsSource, gpsSourceRemeasurement, lasDetection, lasExtendedSource, lasListRemeasurement, lasMergeLog, lasPointSource, lasSource, lasSourceRemeasurement, lasYJHKmergeLog, lasYJHKsource, PreviousStdStarInfo, reliableDxsSource, reliableGcsPointSource, reliableGpsPointSource, reliableLasPointSource, UKIDSSDetection, udsDetection, udsListRemeasurement, udsMergeLog, udsSource, udsSourceRemeasurement WSA Hierarchical Triangular Mesh (HTM) index, 20 deep, for equatorial co-ordinates bigint 8 POS_GENERAL

htmID PreviousAstrometry WSA Hierarchical Triangular Mesh (HTM) index, 20 deep, for equatorial co-ordinates of device centre bigint 8 POS_GENERAL

htmID PreviousAstrometry WSATransit Hierarchical Triangular Mesh (HTM) index, 20 deep, for equatorial co-ordinates of device centre bigint 8 POS_GENERAL

htmID firstSource FIRST Hierarchical Triangular Mesh (HTM) index, 20 deep, for equatorial co-ordinates bigint 8 POS_GENERAL

htmID glimpse_hrc_inter, glimpse_mca_inter GLIMPSE Hierarchical Triangular Mesh (HTM) index, 20 deep, for equatorial co-ordinates bigint 8 POS_GENERAL

htmID iras_psc IRAS Hierarchical Triangular Mesh (HTM) index, 20 deep, for equatorial co-ordinates bigint 8 POS_GENERAL

htmID mgcDetection MGC Hierarchical Triangular Mesh (HTM) index, 20 deep, for equatorial co-ordinates bigint 8 POS_GENERAL

htmID nvssSource NVSS Hierarchical Triangular Mesh (HTM) index, 20 deep, for equatorial co-ordinates bigint 8 POS_GENERAL

htmID ptsDetection WSATransit Hierarchical Triangular Mesh (HTM) index, 20 deep, for equatorial co-ordinates bigint 8 POS_GENERAL

htmID rosat_bsc, rosat_fsc ROSAT Hierarchical Triangular Mesh (HTM) index, 20 deep, for equatorial co-ordinates bigint 8 POS_GENERAL

htmID twomass_psc, twomass_scn, twomass_xsc 2MASS Hierarchical Triangular Mesh (HTM) index, 20 deep, for equatorial co-ordinates bigint 8 POS_GENERAL

htmId CompleteStars, Detection, ReliableGalaxies, ReliableStars, Source SSA Hierarchical Triangular Mesh (20-deep) of centroid bigint 8 POS_GENERAL

htmId Field SSA Hierarchical Triangular Mesh (20-deep) of nominal field centre bigint 8 POS_GENERAL

humidity Multiframe WSA Relative Humidity {image primary HDU keyword: HUMIDITY} real 4 -0.9999995e9 OBS_CONDITIONS

humidity Multiframe WSATransit Relative Humidity {image primary HDU keyword: HUMIDITY} real 4 -0.9999995e9 OBS_CONDITIONS

hXi dxsJKsource, gcsPointSource, gcsZYJHKsource, gpsJHKsource, gpsPointSource, lasExtendedSource, lasPointSource, lasYJHKsource, reliableDxsSource, reliableGcsPointSource, reliableGpsPointSource, reliableLasPointSource WSA Offset of H detection from master position (+east/-west) real 4 arcsec -0.9999995e9 POS_EQ_RA_OFF

hXi dxsSource, gcsSource, gpsSource, lasSource, udsSource WSA Offset of H detection from master position (+east/-west) real 4 arcsec -0.9999995e9 POS_EQ_RA_OFF

When associating individual passband detections into merged sources, a generous (in terms of the positional uncertainties) pairing radius of 2.0 (UKIDSS LAS and GPS; also non-survey programmes) or 1.0 (UKIDSS GPS, DXS and UDS) arcseconds is used, the higher value enabling pairing of moving sources when epoch separations may be several years. Such a large association criterion can of course lead to spurious pairings in the merged sources lists (although note that between passband pairs, handshake pairing is done: both passbands must agree that the candidate pair is their nearest neighbour for the pair to propagate through into the merged source table). In order to help filter spurious pairings out, and assuming that large positional offsets between the different passband detections are not expected (e.g. because of source motion, or larger than usual positional uncertainties) then the attributes Xi and Eta can be used to filter any pairings with suspiciously large offsets in one or more bands. For example, for a clean sample of QSOs from the LAS, you might wish to insist that the offsets in the selected sample are all below 1 arcsecond: simply add WHERE clauses into the SQL sample selection script to exclude all Xi and Eta values larger than the threshold you want.

hz10cd Multiframe WSA Trefoil: HZ10CD {image primary HDU keyword: HZ10CD} real 4 -0.9999995e9

hz10cd Multiframe WSATransit Trefoil: HZ10CD {image primary HDU keyword: HZ10CD} real 4 -0.9999995e9

hz10ch Multiframe WSA Trefoil: HZ10CH {image primary HDU keyword: HZ10CH} real 4 -0.9999995e9

hz10ch Multiframe WSATransit Trefoil: HZ10CH {image primary HDU keyword: HZ10CH} real 4 -0.9999995e9

hz10sd Multiframe WSA Trefoil: HZ10SD {image primary HDU keyword: HZ10SD} real 4 -0.9999995e9

hz10sd Multiframe WSATransit Trefoil: HZ10SD {image primary HDU keyword: HZ10SD} real 4 -0.9999995e9

hz10sh Multiframe WSA Trefoil: HZ10SH {image primary HDU keyword: HZ10SH} real 4 -0.9999995e9

hz10sh Multiframe WSATransit Trefoil: HZ10SH {image primary HDU keyword: HZ10SH} real 4 -0.9999995e9

hz5cd Multiframe WSA Astigmatism: HZ5CD {image primary HDU keyword: HZ5CD} real 4 -0.9999995e9

hz5cd Multiframe WSATransit Astigmatism: HZ5CD {image primary HDU keyword: HZ5CD} real 4 -0.9999995e9

hz5ch Multiframe WSA Astigmatism: HZ5CH {image primary HDU keyword: HZ5CH} real 4 -0.9999995e9

hz5ch Multiframe WSATransit Astigmatism: HZ5CH {image primary HDU keyword: HZ5CH} real 4 -0.9999995e9

hz5sd Multiframe WSA Astigmatism: HZ5SD {image primary HDU keyword: HZ5SD} real 4 -0.9999995e9

hz5sd Multiframe WSATransit Astigmatism: HZ5SD {image primary HDU keyword: HZ5SD} real 4 -0.9999995e9

hz5sh Multiframe WSA Astigmatism: HZ5SH {image primary HDU keyword: HZ5SH} real 4 -0.9999995e9

hz5sh Multiframe WSATransit Astigmatism: HZ5SH {image primary HDU keyword: HZ5SH} real 4 -0.9999995e9

hz6cd Multiframe WSA Astigmatism: HZ6CD {image primary HDU keyword: HZ6CD} real 4 -0.9999995e9

hz6cd Multiframe WSATransit Astigmatism: HZ6CD {image primary HDU keyword: HZ6CD} real 4 -0.9999995e9

hz6ch Multiframe WSA Astigmatism: HZ6CH {image primary HDU keyword: HZ6CH} real 4 -0.9999995e9

hz6ch Multiframe WSATransit Astigmatism: HZ6CH {image primary HDU keyword: HZ6CH} real 4 -0.9999995e9

hz6sd Multiframe WSA Astigmatism: HZ6SD {image primary HDU keyword: HZ6SD} real 4 -0.9999995e9

hz6sd Multiframe WSATransit Astigmatism: HZ6SD {image primary HDU keyword: HZ6SD} real 4 -0.9999995e9

hz6sh Multiframe WSA Astigmatism: HZ6SH {image primary HDU keyword: HZ6SH} real 4 -0.9999995e9

hz6sh Multiframe WSATransit Astigmatism: HZ6SH {image primary HDU keyword: HZ6SH} real 4 -0.9999995e9

hz9cd Multiframe WSA Trefoil: HZ9CD {image primary HDU keyword: HZ9CD} real 4 -0.9999995e9

hz9cd Multiframe WSATransit Trefoil: HZ9CD {image primary HDU keyword: HZ9CD} real 4 -0.9999995e9

hz9ch Multiframe WSA Trefoil: HZ9CH {image primary HDU keyword: HZ9CH} real 4 -0.9999995e9

hz9ch Multiframe WSATransit Trefoil: HZ9CH {image primary HDU keyword: HZ9CH} real 4 -0.9999995e9

hz9sd Multiframe WSA Trefoil: HZ9SD {image primary HDU keyword: HZ9SD} real 4 -0.9999995e9

hz9sd Multiframe WSATransit Trefoil: HZ9SD {image primary HDU keyword: HZ9SD} real 4 -0.9999995e9

hz9sh Multiframe WSA Trefoil: HZ9SH {image primary HDU keyword: HZ9SH} real 4 -0.9999995e9

hz9sh Multiframe WSATransit Trefoil: HZ9SH {image primary HDU keyword: HZ9SH} real 4 -0.9999995e9

WFAU, Institute for Astronomy,
Royal Observatory, Blackford Hill
Edinburgh, EH9 3HJ, UK
Tel +44 131 668 8356 (office)
or +44 131 668 8100 (switchboard)

wsa-support@roe.ac.uk
27/01/2009