ACDS V10.0 - Detailed Description of VII/233

ACDS V10.0 - Wed Jan 15 16:34:15 CET 2025

| # Detailed Description of VII/233 : 2MASS All-Sky Extended Source Catalog (XSC) (IPAC/UMass, 2003-2006) |

Note : this is the description file of the original catalog. This HTML page corresponds well to the original description, but some minor changes in the format may have been introduced in the FITS output files in order to allow for arithmetic operations on quantities such as coordinates and times. h:m:s and d:m:s units are normally converted into degrees, and YYYY-MM-DD into julian days.
Similarly, some slight changes may have been introduced in the units; the value given in the HTML files supersedes the value indicated in the ReadMe file for this catalogue.

    VII/233    2MASS All-Sky Extended Source Catalog (XSC)   (IPAC/UMass, 2003-2006)
    ================================================================================
    The Two Micron All Sky Survey: Extended sources
        Skrutskie M.F., Cutri R.M., Stiening R., Weinberg M.D., Schneider S.,
        Carpenter J.M., Beichman C., Capps R., Chester T., Elias J., Huchra
        J., Liebert J., Lonsdale C., Monet D.G., Price S., Seitzer P., Jarrett
        T., Kirkpatrick J.D., Gizis J.E., Howard E., Evans T., Fowler J.,
        Fullmer L., Hurt R., Light R., Kopan E.L., Marsh K.A., McCallon H. L.,
        Tam R., Van Dyk S., Wheelock S.
       <Astron. J. 131, 1163 (2006)>
       =2006AJ....131.1163S
    ================================================================================
    ADC_Keywords: Galaxies, IR; Infrared sources ; Photometry, infrared ; Surveys

    Keywords: Catalogs - Infrared: General - Surveys

    Description:
        Between 1997 June and 2001 February the Two Micron All Sky Survey
        (2MASS) collected 25.4 Tbytes of raw imaging data covering 99.998% of
        the celestial sphere in the near-infrared J(1.25µm), H(1.65µm),
        and Ks(2.16µm) bandpasses. Observations were conducted from two
        dedicated 1.3 m diameter telescopes located at Mount Hopkins, Arizona,
        and Cerro Tololo, Chile. The 2MASS All-Sky Data Release includes the
        FITS images covering the entire sky, a Point Source Catalog (PSC) of
        471 million sources (Cat. II/242), and the present Extended Source
        Catalog.

        The 2MASS Extended Source Catalog contains sources that are extended
        with respect to the instantaneous PSF, such as galaxies and Galactic
        nebulae. The algorithms used to create the 2MASX catalog are described
        by Jarett et al. (2000AJ....119.2498J), and in the 2MASS Explanatory
        Supplement (accessible from the 2MASS Home Page). Briefly, point/
        extended-source discrimination was conducted for each band-merged
        point-source detection by comparing a variety of radial shape, surface
        brightness, image moments, and symmetry parameters with characteristic
        stellar parameters using an oblique decision tree classifier. The
        classification tests included filters to exclude double and triple
        stars, which were one of the main contaminants in high source density
        regions. Stellar parameters were measured empirically as a function
        of time in each scan to compensate for variations in the atmospheric
        seeing using the aggregate properties of band-merged point-source
        extractions.

        The catalog contains 389 columns described briefly in the
        "Byte-by-byte Description" section below; their description
        includes also the 2MASS database original column names used
        in the original descriptions.

    Acknowledging 2MASS in Publications:
        Please include the following standard acknowledgement in any
        published material that makes use of the 2MASS data products:

       "This publication makes use of data products from the Two Micron
        All Sky Survey, which is a joint project of the University
        of Massachusetts and the Infrared Processing and Analysis
        Center/California Institute of Technology, funded by the
        National Aeronautics and Space Administration and the
        National Science Foundation."
    File Summary:

    File Summary:

           FileName      Lrecl  Records   Explanations

    ×                   80        .   This file
    × ReadMe            80        .   This file
    × xsc.dat         2194  1647599  *The 2MASS Extended Catalog (2MASX)

    Note on xsc.dat: the file is split into smaller pieces of 50,000 objects
          each, named xsc.dat.00 to xsc.dat.32

    See also:
        http://spider.ipac.caltech.edu/staff/jarrett/2mass/XSC/ : XSC  Home Page
        http://www.ipac.caltech.edu/2mass/ : 2MASS Home Page
        II/246 : 2MASS All-Sky Catalog of Point Sources (Cutri+ 2003)

    Byte-by-byte Description of file:  xsc.dat

       Bytes Format Units    Label     Explanations

       1- 13  F13.4 d        JDobs     ? Julian date of the observation (1)
      15- 31  A17   ---      2MASX     Source name (HHMMSSss+DDMMSSs, J2000)
      33- 42  F10.6 deg      RAdeg     Right ascension (J2000), based on peak pixel
      44- 53  F10.6 deg      DEdeg     Declination (J2000), based on peak pixel
      55- 64  F10.6 deg      supRAdeg  ? Super-coadd centroid RA (J2000) (sup_ra)
      66- 75  F10.6 deg      supDEdeg  ? Super-coadd centroid Dec (J2000) (sup_dec)
      77- 83  F7.3  deg      GLon      Galactic longitude
      85- 91  F7.3  deg      GLat      Galactic latitude
      93- 97  F5.2  [---]    dens      ? Coadd log(density) of stars with k<14mag
    --------------------------------------------------------------------------------
      99-104  F6.1  arcsec   r.K20e    ? Semi-major axis of fiducial ellipse at
                                         isophote K=20mag/arcsec2 (r_k20fe)
     106-111  F6.3  mag      J.K20e    ? J magnitude in K20e ellipse (jmk20fe)
     113-117  F5.3  mag      e_J.K20e  ? {sigma}(J.K20e) (jmsigk20fe)
         119  I1    ---      f_J.K20e  ? Confusion flags of J.K20e (jflgk20fe) (2)
     121-126  F6.3  mag      H.K20e    ? H magnitude in K20e ellipse (hmk20fe)
     128-132  F5.3  mag      e_H.K20e  ? {sigma}(H.K20e) (hmsigk20fe)
         134  I1    ---      f_H.K20e  ? Confusion flags of H.K20e (hflgk20fe) (2)
     136-141  F6.3  mag      K.K20e    ? K magnitude in K20e ellipse (kmk20fe)
     143-147  F5.3  mag      e_K.K20e  ? {sigma}(K.K20e) (kmsigk20fe)
         149  I1    ---      f_K.K20e  ? Confusion flags of K.K20e (kflgk20fe) (2)
    --------------------------------------------------------------------------------
     151-155  F5.1  arcsec   r3sig     ? Semi-major axis of 3{sigma} K isophotal
                                         ellipse (r_3sig)
     157-161  F5.3  ---      Jb/a      ? J minor/major axis ratio to 3{sigma} (j_ba)
     163-165  I3    deg      Jpa       ? J pos.angle of 3{sigma} ellipse (j_phi)
     167-171  F5.3  ---      Hb/a      ? H minor/major axis ratio to 3{sigma} (h_ba)
     173-175  I3    deg      Hpa       ? H pos.angle to 3{sigma} ellipse (h_phi)
     177-181  F5.3  ---      Kb/a      ? K minor/major axis ratio to 3{sigma} (k_ba)
     183-185  I3    deg      Kpa       ? K pos.angle to 3{sigma} ellipse (k_phi)
     187-191  F5.1  arcsec   rS3sig    ? Semi-major axis of super-coadd 3{sigma}
                                         isophotal ellipse (supr3sig)
     193-197  F5.3  ---      Sb/a      ? Minor/major axis ratio to rS3sig (sup_ba)
     199-201  I3    deg      Spa       ? Pos.angle of rS3sig (sup_phi)
    --------------------------------------------------------------------------------
     203-208  F6.1  arcsec   r.fe      ? K fiducial Kron elliptical aperture
                                         semi-major axis (r_fe)
     210-215  F6.3  mag      J.fe      ? J magnitude in r.fe (jmfe)
     217-221  F5.3  mag      e_J.fe    ? {sigma}(J.fe) (jmsigfe)
         223  I1    ---      f_J.fe    ? Confusion flags of J.fe (jflgfe) (2)
     225-230  F6.3  mag      H.fe      ? H magnitude in r.fe (hmfe)
     232-236  F5.3  mag      e_H.fe    ? {sigma}(H.fe) (hmsigfe)
         238  I1    ---      f_H.fe    ? Confusion flags of H.fe (hflgfe) (2)
     240-245  F6.3  mag      K.fe      ? K magnitude in r.fe (kmfe)
     247-251  F5.3  mag      e_K.fe    ? {sigma}(K.fe) (kmsigfe)
         253  I1    ---      f_K.fe    ? Confusion flags of K.fe (kflgfe) (2)
    --------------------------------------------------------------------------------
     255-261  F7.2  arcsec   r.ext     ? Extrapolation/total radius of fit to
                                         radial profile (r_ext)
     263-268  F6.3  mag      J.ext     ? J magnitude in r.ext (jmext)
     270-274  F5.3  mag      e_J.ext   ? {sigma}(J.ext) (jmsigext)
     276-281  F6.3  ---      n_J.ext   ? {chi}2(J.ext) (j_pchi) (3)
     283-288  F6.3  mag      H.ext     ? J magnitude in r.ext (hmext)
     290-294  F5.3  mag      e_H.ext   ? {sigma}(H.ext) (hmsigext)
     296-301  F6.3  ---      n_H.ext   ? {chi}2(H.ext) (h_pchi) (3)
     303-308  F6.3  mag      K.ext     ? J magnitude in r.ext (kmext)
     310-314  F5.3  mag      e_K.ext   ? {sigma}(K.ext) (kmsigext)
     316-321  F6.3  ---      n_K.ext   ? {chi}2(K.ext) (k_pchi) (3)
    --------------------------------------------------------------------------------
     323-328  F6.2  arcsec   Jr.eff    ? J half-light radius (jreff)
     330-334  F5.2 mag/arcsec2 Jmu     ? J mean surface brightness (jmnsurfbeff)
     336-341  F6.2  arcsec   Hr.eff    ? H half-light radius (hreff)
     343-347  F5.2 mag/arcsec2 Hmu     ? H mean surface brightness (hmnsurfbeff)
     349-354  F6.2  arcsec   Kr.eff    ? K half-light radius (kreff)
     356-360  F5.2 mag/arcsec2 Kmu     ? K mean surface brightness (kmnsurfbeff)
     362-366  F5.2  ---      Jconc     ? J concentration index (jconindx) (3)
     368-372  F5.2  ---      Hconc     ? H concentration index (hconindx) (3)
     374-378  F5.2  ---      Kconc     ? K concentration index (kconindx) (3)
     380-385  F6.2 mag/arcsec2 J.peak  ? J peak pixel brightness (j_peak)
     387-392  F6.2 mag/arcsec2 H.peak  ? H peak pixel brightness (h_peak)
     394-399  F6.2 mag/arcsec2 K.peak  ? K peak pixel brightness (k_peak)
     401-406  F6.2 mag/arcsec2 J.c5    ? J central surface brightness (r<=5")
                                         (j_5surf)
     408-413  F6.2 mag/arcsec2 H.c5    ? H central surface brightness (r<=5")
                                         (h_5surf)
     415-420  F6.2 mag/arcsec2 K.c5    ? K central surface brightness (r<=5")
                                         (k_5surf)
    --------------------------------------------------------------------------------
     422-426  F5.2  ---      xScore    [1,2]? extended score (e_score) (4)
     428-432  F5.2  ---      gScore    [1,2]? galaxy score (g_score) (4)
     434-435  I2    ---      vc        Visual verification of source (5)
         437  A1    ---      cc        Contamination or confusion flag (cc_flg) (6)
     439-442  I4    pix      imNx      ? Size of postage stamp image (im_nx)
    --------------------------------------------------------------------------------
     444-448  F5.1  arcsec   r.K20c    ? Radius of fiducial circle at
                                         isophote K=20mag/arcsec2 (r_k20fc)
     450-455  F6.3  mag      J.K20c    ? J magnitude in r.K20c (jmk20fc)
     457-461  F5.3  mag      e_J.K20c  ? {sigma}(J.K20c) (jmsigk20fc)
         463  I1    ---      f_J.K20c  ? Confusion flags of J.K20c (jflgk20fc) (2)
     465-470  F6.3  mag      H.K20c    ? H magnitude in r.K20c (hmk20fc)
     472-476  F5.3  mag      e_H.K20c  ? {sigma}(H.K20c) (hmsigk20fc)
         478  I1    ---      f_H.K20c  ? Confusion flags of H.K20c (hflgk20fc) (2)
     480-485  F6.3  mag      K.K20c    ? K magnitude in r.K20c (kmk20fc)
     487-491  F5.3  mag      e_K.K20c  ? {sigma}(K.K20c) (kmsigk20fc)
         493  I1    ---      f_K.K20c  ? Confusion flags of K.K20c (kflgk20fc) (2)
    --------------------------------------------------------------------------------
     495-499  F5.1  arcsec   Jr.e      ? J Kron ellipse semi-major axis (jre)
     501-506  F6.3  mag      J.e       ? J magnitude in Jr.e (jme)
     508-512  F5.3  mag      e_J.e     ? {sigma}(J.e) (jmsige)
         514  I1    ---      f_J.e     ? Confusion flags of J.e (jflge) (2)
     516-520  F5.1  arcsec   Hr.e      ? H Kron ellipse semi-major axis (hre)
     522-527  F6.3  mag      H.e       ? H magnitude in Hr.e (hme)
     529-533  F5.3  mag      e_H.e     ? {sigma}(H.e) (hmsige)
         535  I1    ---      f_H.e     ? Confusion flags of J.e (hflge) (2)
     537-541  F5.1  arcsec   Kr.e      ? K Kron ellipse semi-major axis (kre)
     543-548  F6.3  mag      K.e       ? K magnitude in Kr.e (kme)
     550-554  F5.3  mag      e_K.e     ? {sigma}(K.e) (kmsige)
         556  I1    ---      f_K.e     ? Confusion flags of K.e (kflge) (2)
    --------------------------------------------------------------------------------
     558-562  F5.1  arcsec   Jr.c      ? J Kron circular aperture radius (jrc)
     564-569  F6.3  mag      J.c       ? J Kron circular aperture magnitude (jmc)
     571-575  F5.3  mag      e_J.c     ? {sigma}(J.c) (jmsigc)
         577  I1    ---      f_J.c     ? Confusion flags of J.c (jflgc) (2)
     579-583  F5.1  arcsec   Hr.c      ? H Kron circular aperture radius (hrc)
     585-590  F6.3  mag      H.c       ? H Kron circular aperture magnitude (hmc)
     592-596  F5.3  mag      e_H.c     ? {sigma}(H.c) (hmsigc)
         598  I1    ---      f_H.c     ? Confusion flags of H.c (hflgc) (2)
     600-604  F5.1  arcsec   Kr.c      ? K Kron circular aperture radius (krc)
     606-611  F6.3  mag      K.c       ? K Kron circular aperture magnitude (kmc)
     613-617  F5.3  mag      e_K.c     ? {sigma}(K.c) (kmsigc)
         619  I1    ---      f_K.c     ? Confusion flags of K.c (kflgc) (2)
    --------------------------------------------------------------------------------
     621-625  F5.1  arcsec   r.fc      ? K fiducial Kron circular radius (r_fc)
     627-632  F6.3  mag      J.fc      ? J magnitude in r.fc (jmfc)
     634-638  F5.3  mag      e_J.fc    ? {sigma}(J.fc) (jmsigfc)
         640  I1    ---      f_J.fc    ? Confusion flags of J.fc (jflgfc) (2)
     642-647  F6.3  mag      H.fc      ? H fiducial Kron circular magnitude (hmfc)
     649-653  F5.3  mag      e_H.fc    ? {sigma}(H.fc) (hmsigfc)
         655  I1    ---      f_H.fc    ? Confusion flags of H.fc (hflgfc) (2)
     657-662  F6.3  mag      K.fc      ? K fiducial Kron circular magnitude (kmfc)
     664-668  F5.3  mag      e_K.fc    ? {sigma}(K.fc) (kmsigfc)
         670  I1    ---      f_K.fc    ? Confusion flags of K.fc (kflgfc) (2)
    --------------------------------------------------------------------------------
     672-676  F5.1  arcsec   Jr.i20e   ? Semi-major axis of elliptical aperture at
                                         isophote J=20mag/arcsec2 (jri20e)
     678-683  F6.3  mag      J.i20e    ? J magnitude in Jr.i20e (jmi20e)
     685-689  F5.3  mag      e_J.i20e  ? {sigma}(J.i20e) (jmsigi20e)
         691  I1    ---      f_J.i20e  ? Confusion flags of J.i20e (jflgi20e) (2)
     693-697  F5.1  arcsec   Hr.i20e   ? Semi-major axis of elliptical aperture at
                                         isophote H=20mag/arcsec2 (hri20e)
     699-704  F6.3  mag      H.i20e    ? H magnitude in Hr.i20e (hmi20e)
     706-710  F5.3  mag      e_H.i20e  ? {sigma}(H.i20e) (hmsigi20e)
         712  I1    ---      f_H.i20e  ? Confusion flags of H.i20e (hflgi20e) (2)
     714-718  F5.1  arcsec   Kr.i20e   ? Semi-major axis of elliptical aperture at
                                         isophote K=20mag/arcsec2 (kri20e)
     720-725  F6.3  mag      K.i20e    ? K magnitude in Kr.i20e (kmi20e)
     727-731  F5.3  mag      e_K.i20e  ? {sigma}(K.i20e) (kmsigi20e)
         733  I1    ---      f_K.i20e  ? Confusion flags of K.i20e (kflgi20e) (2)
    --------------------------------------------------------------------------------
     735-739  F5.1  arcsec   Jr.i20c   ? Radius of circular aperture at isophote
                                         J=20mag/arcsec2 (jri20c)
     741-746  F6.3  mag      J.i20c    ? J magnitude in Jr.i20c (jmi20c)
     748-752  F5.3  mag      e_J.i20c  ? {sigma}(J.i20c) (jmsigi20c)
         754  I1    ---      f_J.i20c  ? Confusion flags of J.i20c (jflgi20c) (2)
     756-760  F5.1  arcsec   Hr.i20c   ? Radius of circular aperture at isophote
                                         H=20mag/arcsec2 Hr.i20c (hri20c)
     762-767  F6.3  mag      H.i20c    ? H magnitude in (hmi20c)
     769-773  F5.3  mag      e_H.i20c  ? {sigma}(H.i20c) (hmsigi20c)
         775  I1    ---      f_H.i20c  ? Confusion flags of H.i20c (hflgi20c) (2)
     777-781  F5.1  arcsec   Kr.i20c   ? Radius of circular aperture at isophote
                                         H=20mag/arcsec2 Kr.i20c (kri20c)
     783-788  F6.3  mag      K.i20c    ? K magnitude in (kmi20c)
     790-794  F5.3  mag      e_K.i20c  ? {sigma}(K.i20c) (kmsigi20c)
         796  I1    ---      f_K.i20c  ? Confusion flags of K.i20c (kflgi20c) (2)
    --------------------------------------------------------------------------------
     798-802  F5.1  arcsec   Jr.i21e   ? Semi-major axis of elliptical aperture
                                         at isophote J=21mag/arcsec2  (jri21e)
     804-809  F6.3  mag      J.i21e    ? J magnitude in Jr.i21e (jmi21e)
     811-815  F5.3  mag      e_J.i21e  ? {sigma}(J.i21e) (jmsigi21e)
         817  I1    ---      f_J.i21e  ? Confusion flags of J.i21e (jflgi21e) (2)
     819-823  F5.1  arcsec   Hr.i21e   ? Semi-major axis of elliptical aperture
                                         at isophote h=21mag/arcsec2 (hri21e)
     825-830  F6.3  mag      H.i21e    ? H magnitude in Hr.i21e (hmi21e)
     832-836  F5.3  mag      e_H.i21e  ? {sigma}(H.i21e) (hmsigi21e)
         838  I1    ---      f_H.i21e  ? Confusion flags of H.i21e (hflgi21e) (2)
     840-844  F5.1  arcsec   Kr.i21e   ? Semi-major axis of elliptical aperture
                                         at isophote at K=21mag/arcsec2 (kri21e)
     846-851  F6.3  mag      K.i21e    ? K magnitude in Kr.i21e (kmi21e)
     853-857  F5.3  mag      e_K.i21e  ? {sigma}(K.i21e) (kmsigi21e)
         859  I1    ---      f_K.i21e  ? Confusion flags of K.i21e (kflgi21e) (2)
    --------------------------------------------------------------------------------
     861-865  F5.1  arcsec   r.21fe    ? Semi-major axis of fiducial elliptical
                                         aperture at J=21mag/arcsec2 (r_j21fe)
     867-872  F6.3  mag      J.21fe    ? J magnitude in r.21fe (jmj21fe)
     874-878  F5.3  mag      e_J.21fe  ? {sigma}(J.21fe) (jmsigj21fe)
         880  I1    ---      f_J.21fe  ? Confusion flags of J.21fe (jflgj21fe) (2)
     882-887  F6.3  mag      H.21fe    ? H magnitude in r.21fe (hmj21fe)
     889-893  F5.3  mag      e_H.21fe  ? {sigma}(H.21fe) (hmsigj21fe)
         895  I1    ---      f_H.21fe  ? Confusion flags of H.21fe (hflgj21fe) (2)
     897-902  F6.3  mag      K.21fe    ? K magnitude in r.21fe (kmj21fe)
     904-908  F5.3  mag      e_K.21fe  ? {sigma}(K.21fe) (kmsigj21fe)
         910  I1    ---      f_K.21fe  ? Confusion flags of K.21fe (kflgj21fe) (2)
    --------------------------------------------------------------------------------
     912-916  F5.1  arcsec   Jr.i21c   ? Radius of circular aperture at isophote
                                         J=21mag/arcsec2 (jri21c)
     918-923  F6.3  mag      J.i21c    ? J magnitude in J.i21c (jmi21c)
     925-929  F5.3  mag      e_J.i21c  ? {sigma}(J.i21c) (jmsigi21c)
         931  I1    ---      f_J.i21c  ? Confusion flags of J.i21c (jflgi21c) (2)
     933-937  F5.1  arcsec   Hr.i21c   ? Radius of circular aperture at isophote
                                         H=21mag/arcsec2 (hri21c)
     939-944  F6.3  mag      H.i21c    ? H magnitude in H.i21c (hmi21c)
     946-950  F5.3  mag      e_H.i21c  ? {sigma}(H.i21c) (hmsigi21c)
         952  I1    ---      f_H.i21c  ? Confusion flags of H.i21c (hflgi21c) (2)
     954-958  F5.1  arcsec   Kr.i21c   ? Radius of circular aperture at isophote
                                         K=21mag/arcsec2 (kri21c)
     960-965  F6.3  mag      K.i21c    ? K magnitude in K.i21c (kmi21c)
     967-971  F5.3  mag      e_K.i21c  ? {sigma}(K.i21c) (kmsigi21c)
         973  I1    ---      f_K.i21c  ? Confusion flags of K.i21c (kflgi21c) (2)
    --------------------------------------------------------------------------------
     975-979  F5.1  arcsec   r.21fc    ? J fiducial Kron circular radius at
                                         isophote J=21mag/arcsec2 mag (r_j21fc)
     981-986  F6.3  mag      J.21fc    ? J magnitude in r.21fc (jmj21fc)
     988-992  F5.3  mag      e_J.21fc  ? {sigma}(J.21fc) (jmsigj21fc)
         994  I1    ---      f_J.21fc  ? Confusion flags of J.21fc (jflgj21fc) (2)
     996-1001  F6.3  mag      H.21fc    ? magnitude in r.21fc (hmj21fc)
     1003-1007  F5.3  mag      e_H.21fc  ? {sigma}(H.21fc) (hmsigj21fc)
        1009  I1    ---      f_H.21fc  ? Confusion flags of H.21fc (hflgj21fc) (2)
     1011-1016  F6.3  mag      K.21fc    ? K magnitude in r.21fc (kmj21fc)
     1018-1022  F5.3  mag      e_K.21fc  ? {sigma}(K.21fc) (kmsigj21fc)
        1024  I1    ---      f_K.21fc  ? Confusion flags of K.21fc (kflgj21fc) (2)
    --------------------------------------------------------------------------------
     1026-1031  F6.3  mag      J.a5      ? J magnitude in 5arcsec aperture (jm5)
     1033-1037  F5.3  mag      e_J.a5    ? {sigma}(J.a5) (jmsig5)
        1039  I1    ---      f_J.a5    ? Confusion flags of J.a5 (jflg5) (2)
     1041-1046  F6.3  mag      H.a5      ? H magnitude in 5arcsec aperture (hm5)
     1048-1052  F5.3  mag      e_H.a5    ? {sigma}(H.a5) (hmsig5)
        1054  I1    ---      f_H.a5    ? Confusion flags of H.a5 (hflg5) (2)
     1056-1061  F6.3  mag      K.a5      ? K magnitude in 5arcsec aperture (km5)
     1063-1067  F5.3  mag      e_K.a5    ? {sigma}(K.a5) (kmsig5)
        1069  I1    ---      f_K.a5    ? Confusion flags of K.a5 (kflg5) (2)
    --------------------------------------------------------------------------------
     1071-1076  F6.3  mag      J.a7      ? J magnitude in 7arcsec aperture (jm7)
     1078-1082  F5.3  mag      e_J.a7    ? {sigma}(J.a7) (jmsig7)
        1084  I1    ---      f_J.a7    ? Confusion flags of J.a7 (jflg7) (2)
     1086-1091  F6.3  mag      H.a7      ? H magnitude in 7arcsec aperture (hm7)
     1093-1097  F5.3  mag      e_H.a7    ? {sigma}(H.a7) (hmsig7)
        1099  I1    ---      f_H.a7    ? Confusion flags of H.a7 (hflg7) (2)
     1101-1106  F6.3  mag      K.a7      ? K magnitude in 7arcsec aperture (km7)
     1108-1112  F5.3  mag      e_K.a7    ? {sigma}(K.a7) (kmsig7)
        1114  I1    ---      f_K.a7    ? Confusion flags of K.a7 (kflg7) (2)
    --------------------------------------------------------------------------------
     1116-1121  F6.3  mag      J.10      ? J magnitude in 10arcsec aperture (jm10)
     1123-1127  F5.3  mag      e_J.10    ? {sigma}(J.10) (jmsig10)
        1129  I1    ---      f_J.10    ? Confusion flags of J.10 (jflg10) (2)
     1131-1136  F6.3  mag      H.10      ? H magnitude in 10arcsec aperture (hm10)
     1138-1142  F5.3  mag      e_H.10    ? {sigma}(H.10) (hmsig10)
        1144  I1    ---      f_H.10    ? Confusion flags of H.10 (hflg10) (2)
     1146-1151  F6.3  mag      K.10      ? K magnitude in 10arcsec aperture (km10)
     1153-1157  F5.3  mag      e_K.10    ? {sigma}(K.10) (kmsig10)
        1159  I1    ---      f_K.10    ? Confusion flags of K.10 (kflg10) (2)
    --------------------------------------------------------------------------------
     1161-1166  F6.3  mag      J.15      ? J magnitude in 15arcsec aperture (jm15)
     1168-1172  F5.3  mag      e_J.15    ? {sigma}(J.15) (jmsig15)
        1174  I1    ---      f_J.15    ? Confusion flags of J.15 (jflg15) (2)
     1176-1181  F6.3  mag      H.15      ? H magnitude in 15arcsec aperture (hm15)
     1183-1187  F5.3  mag      e_H.15    ? {sigma}(H.15) (hmsig15)
        1189  I1    ---      f_H.15    ? Confusion flags of H.15 (hflg15) (2)
     1191-1196  F6.3  mag      K.15      ? K magnitude in 15arcsec aperture (km15)
     1198-1202  F5.3  mag      e_K.15    ? {sigma}(K.15) (kmsig15)
        1204  I1    ---      f_K.15    ? Confusion flags of K.15 (kflg15) (2)
    --------------------------------------------------------------------------------
     1206-1211  F6.3  mag      J.20      ? J magnitude in 20arcsec aperture (jm20)
     1213-1217  F5.3  mag      e_J.20    ? {sigma}(J.20) (jmsig20)
        1219  I1    ---      f_J.20    ? Confusion flags of J.20 (jflg20) (2)
     1221-1226  F6.3  mag      H.20      ? H magnitude in 20arcsec aperture (hm20)
     1228-1232  F5.3  mag      e_H.20    ? {sigma}(H.20) (hmsig20)
        1234  I1    ---      f_H.20    ? Confusion flags of H.20 (hflg20) (2)
     1236-1241  F6.3  mag      K.20      ? K magnitude in 20arcsec aperture (km20)
     1243-1247  F5.3  mag      e_K.20    ? {sigma}(K.20) (kmsig20)
        1249  I1    ---      f_K.20    ? Confusion flags of K.20 (kflg20) (2)
    --------------------------------------------------------------------------------
     1251-1256  F6.3  mag      J.25      ? J magnitude in 25arcsec aperture (jm25)
     1258-1262  F5.3  mag      e_J.25    ? {sigma}(J.25) (jmsig25)
        1264  I1    ---      f_J.25    ? Confusion flags of J.25 (jflg25) (2)
     1266-1271  F6.3  mag      H.25      ? H magnitude in 25arcsec aperture (hm25)
     1273-1277  F5.3  mag      e_H.25    ? {sigma}(H.25) (hmsig25)
        1279  I1    ---      f_H.25    ? Confusion flags of H.25 (hflg25) (2)
     1281-1286  F6.3  mag      K.25      ? K magnitude in 25arcsec aperture (km25)
     1288-1292  F5.3  mag      e_K.25    ? {sigma}(K.25) (kmsig25)
        1294  I1    ---      f_K.25    ? Confusion flags of K.25 (kflg25) (2)
    --------------------------------------------------------------------------------
     1296-1301  F6.3  mag      J.30      ? J magnitude in 30arcsec aperture (jm30)
     1303-1307  F5.3  mag      e_J.30    ? {sigma}(J.30) (jmsig30)
        1309  I1    ---      f_J.30    ? Confusion flags of J.30 (jflg30) (2)
     1311-1316  F6.3  mag      H.30      ? H magnitude in 30arcsec aperture (hm30)
     1318-1322  F5.3  mag      e_H.30    ? {sigma}(H.30) (hmsig30)
        1324  I1    ---      f_H.30    ? Confusion flags of H.30 (hflg30) (2)
     1326-1331  F6.3  mag      K.30      ? K magnitude in 30arcsec aperture (km30)
     1333-1337  F5.3  mag      e_K.30    ? {sigma}(K.30) (kmsig30)
        1339  I1    ---      f_K.30    ? Confusion flags of K.30 (kflg30) (2)
    --------------------------------------------------------------------------------
     1341-1346  F6.3  mag      J.40      ? J magnitude in 40arcsec aperture (jm40)
     1348-1352  F5.3  mag      e_J.40    ? {sigma}(J.40) (jmsig40)
        1354  I1    ---      f_J.40    ? Confusion flags of J.40 (jflg40) (2)
     1356-1361  F6.3  mag      H.40      ? H magnitude in 40arcsec aperture (hm40)
     1363-1367  F5.3  mag      e_H.40    ? {sigma}(H.40) (hmsig40)
        1369  I1    ---      f_H.40    ? Confusion flags of H.40 (hflg40) (2)
     1371-1376  F6.3  mag      K.40      ? K magnitude in 40arcsec aperture (km40)
     1378-1382  F5.3  mag      e_K.40    ? {sigma}(K.40) (kmsig40)
        1384  I1    ---      f_K.40    ? Confusion flags of K.40 (kflg40) (2)
    --------------------------------------------------------------------------------
     1386-1391  F6.3  mag      J.50      ? J magnitude in 50arcsec aperture (jm50)
     1393-1397  F5.3  mag      e_J.50    ? {sigma}(J.50) (jmsig50)
        1399  I1    ---      f_J.50    ? Confusion flags of J.50 (jflg50)
     1401-1406  F6.3  mag      H.50      ? H magnitude in 50arcsec aperture (hm50)
     1408-1412  F5.3  mag      e_H.50    ? {sigma}(H.50) (hmsig50)
        1414  I1    ---      f_H.50    ? Confusion flags of H.50 (hflg50) (2)
     1416-1421  F6.3  mag      K.50      ? K magnitude in 50arcsec aperture (km50)
     1423-1427  F5.3  mag      e_K.50    ? {sigma}(K.50) (kmsig50)
        1429  I1    ---      f_K.50    ? Confusion flags of K.50 (kflg50) (2)
    --------------------------------------------------------------------------------
     1431-1436  F6.3  mag      J.60      ? J magnitude in 60arcsec aperture (jm60)
     1438-1442  F5.3  mag      e_J.60    ? {sigma}(J.60) (jmsig60)
        1444  I1    ---      f_J.60    ? Confusion flags of J.60 (jflg60) (2)
     1446-1451  F6.3  mag      H.60      ? H magnitude in 60arcsec aperture (hm60)
     1453-1457  F5.3  mag      e_H.60    ? {sigma}(H.60) (hmsig60)
        1459  I1    ---      f_H.60    ? Confusion flags of H.60 (hflg60) (2)
     1461-1466  F6.3  mag      K.60      ? K magnitude in 60arcsec aperture (km60)
     1468-1472  F5.3  mag      e_K.60    ? {sigma}(K.60) (kmsig60)
        1474  I1    ---      f_K.60    ? Confusion flags of K.60 (kflg60) (2)
    --------------------------------------------------------------------------------
     1476-1481  F6.3  mag      J.70      ? J magnitude in 70arcsec aperture (jm70)
     1483-1487  F5.3  mag      e_J.70    ? {sigma}(J.70) (jmsig70)
        1489  I1    ---      f_J.70    ? Confusion flags of J.70 (jflg70) (2)
     1491-1496  F6.3  mag      H.70      ? H magnitude in 70arcsec aperture (hm70)
     1498-1502  F5.3  mag      e_H.70    ? {sigma}(H.70) (hmsig70)
        1504  I1    ---      f_H.70    ? Confusion flags of H.70 (hflg70) (2)
     1506-1511  F6.3  mag      K.70      ? K magnitude in 70arcsec aperture (km70)
     1513-1517  F5.3  mag      e_K.70    ? {sigma}(K.70) (kmsig70)
        1519  I1    ---      f_K.70    ? Confusion flags of K.70 (kflg70) (2)
    --------------------------------------------------------------------------------
     1521-1526  F6.3  mag      J.sys     ? J system magnitude (jmsys) (11)
     1528-1532  F5.3  mag      e_J.sys   ? {sigma}(J.sys) (jmsigsys)
     1534-1539  F6.3  mag      H.sys     ? H system magnitude (hmsys) (11)
     1541-1545  F5.3  mag      e_H.sys   ? {sigma}(H.sys) (hmsigsys)
     1547-1552  F6.3  mag      K.sys     ? K system magnitude (kmsys) (11)
     1554-1558  F5.3  mag      e_K.sys   ? {sigma}(K.sys) (kmsigsys)
        1560  I1    ---      sysFlg    [0,1]? system flag: 0=no system,
                                         1=nearby galaxy flux (sys_flg)
        1562  I1    ---      ctmFlg    [0,1]? contamination flag: 0=no stars,
                                         1=stellar flux (contam_flg)
    --------------------------------------------------------------------------------
     1564-1568  F5.3  ---      Jba5s     ? J minor/major axis ratio to 5{sigma} fit
                                         (j5sigba)
     1570-1572  I3    deg      Jpa5s     ? J pos.angle to 5{sigma} fit (j5sigphi)
     1574-1578  F5.3  ---      Hba5s     ? H minor/major axis ratio to 5{sigma} fit
                                         (h5sigba)
     1580-1582  I3    deg      Hpa5s     ? H pos.angle to 5{sigma} fit (h5sigphi)
     1584-1588  F5.3  ---      Kba5s     ? K minor/major axis ratio to 5{sigma} fit
                                        (k5sigba)
     1590-1592  I3    deg      Kpa5s     ? K pos.angle to 5{sigma} fit (k5sigphi)
    --------------------------------------------------------------------------------
     1594-1596  I3    ---      JdA       ? J 5{sigma}/3{sigma} differential area
                                         (jdarea)
     1598-1600  I3    %        JpcdA     ? J 5{sigma}/3{sigma} relative area change
                                         (jpercdarea)
     1602-1604  I3    ---      HdA       ? H 5{sigma}/3{sigma} differential area
                                         (hdarea)
     1606-1608  I3    %        HpcdA     ? H 5{sigma}/3{sigma} relative area change
                                         (hpercdarea)
     1610-1612  I3    ---      KdA       ? K 5{sigma}/3{sigma} differential area
                                         (kdarea)
     1614-1616  I3    %        KpcdA     ? K 5{sigma}/3{sigma} relative area change
                                         (kpercdarea)
    --------------------------------------------------------------------------------
     1618-1622  F5.3  ---      Jrat.bs   ? J bi-symmetric flux ratio (jbisymrat)
     1624-1629  F6.3  ---      Jchi.bs   ? J bi-symmetric x-correlation (jbisymchi)
     1631-1635  F5.3  ---      Hrat.bs   ? H bi-symmetric flux ratio (hbisymrat)
     1637-1642  F6.3  ---      Hchi.bs   ? H bi-symmetric x-correlation (hbisymchi)
     1644-1648  F5.3  ---      Krat.bs   ? K bi-symmetric flux ratio (kbisymrat)
     1650-1655  F6.3  ---      Kchi.bs   ? K bi-symmetric x-correlation (kbisymchi)
    --------------------------------------------------------------------------------
     1657-1661  F5.2  ---      Jsh0      ? J ridge shape (LCSB: BSNR limit) (j_sh0)
     1663-1667  F5.2  ---      e_Jsh0    ? {sigma}(Jsh0) (jsigsh0)
     1669-1673  F5.2  ---      Hsh0      ? H ridge shape (LCSB: BSNR limit) (h_sh0)
     1675-1679  F5.2  ---      e_Hsh0    ? {sigma}(Jsh0) (hsigsh0)
     1681-1685  F5.2  ---      Ksh0      ? K ridge shape (LCSB: BSNR limit) (k_sh0)
     1687-1691  F5.2  ---      e_Ksh0    ? {sigma}(Jsh0) (ksigsh0)
     1693-1698  F6.1  ---      Jsc.mx    ? J mxdn score (LCSB: BSNR -
                                         block/smoothed SNR) (jscmxdn)
     1700-1705  F6.1  ---      Jsc.sh    ? J shape score (jscsh)
     1707-1712  F6.1  ---      Jsc.wsh   ? J wsh score (LCSB: PSNR - peak raw SNR)
                                         (jscwsh)
     1714-1719  F6.1  ---      Jsc.r23   ? J r23 score (LCSB: TSNR - integrated SNR
                                         for r=15) (jscr23)
     1721-1726  F6.1  ---      Jsc.1mm   ? J 1st moment score (LCSB:
                                         super blk 2,4,8 SNR) (jsc1mm)
     1728-1733  F6.1  ---      Jsc.2mm   ? J 2nd moment score (LCSB: SNRMAX -
                                         super SNR max.) (jsc2mm)
     1735-1740  F6.1  ---      Jsc.vint  ? J vint score (jscvint)
     1742-1747  F6.1  ---      Jsc.r1    ? J r1 score (jscr1)
     1749-1754  F6.1  ---      Jsc.msh   [0]? J median shape score (jscmsh)
     1756-1761  F6.1  ---      Hsc.mx    ? H mxdn score (LCSB: BSNR -
                                         block/smoothed SNR) (hscmxdn)
     1763-1768  F6.1  ---      Hsc.sh    ? H shape score (hscsh)
     1770-1775  F6.1  ---      Hsc.wsh   ? H wsh score (LCSB: PSNR - peak raw SNR)
                                         (hscwsh)
     1777-1782  F6.1  ---      Hsc.r23   ? H r23 score (LCSB: TSNR - integrated SNR
                                         for r=15) (hscr23)
     1784-1789  F6.1  ---      Hsc.1mm   ? H 1st moment score (LCSB:
                                         super blk 2,4,8 SNR) (hsc1mm)
     1791-1796  F6.1  ---      Hsc.2mm   ? H 2nd moment score (LCSB: SNRMAX -
                                         super SNR max.) (hsc2mm)
     1798-1803  F6.1  ---      Hsc.vint  ? H vint score (hscvint)
     1805-1810  F6.1  ---      Hsc.r1    ? H r1 score (hscr1)
     1812-1817  F6.1  ---      Hsc.msh   [0]? H median shape score (hscmsh)
     1819-1824  F6.1  ---      Ksc.mx    ? K mxdn score (LCSB: BSNR -
                                         block/smoothed SNR) (kscmxdn)
     1826-1831  F6.1  ---      Ksc.sh    ? K shape score (kscsh)
     1833-1838  F6.1  ---      Ksc.wsh   ? K wsh score (LCSB: PSNR - peak raw SNR)
                                         (kscwsh)
     1840-1845  F6.1  ---      Ksc.r23   ? K r23 score (LCSB: TSNR - integrated SNR
                                         for r=15) (kscr23)
     1847-1852  F6.1  ---      Ksc.1mm   ? K 1st moment score (LCSB:
                                         super blk 2,4,8 SNR) (ksc1mm)
     1854-1859  F6.1  ---      Ksc.2mm   ? K 2nd moment score (LCSB: SNRMAX -
                                         super SNR max.) (ksc2mm)
     1861-1866  F6.1  ---      Ksc.vint  ? K vint score (kscvint)
     1868-1873  F6.1  ---      Ksc.r1    ? K r1 score (kscr1)
     1875-1880  F6.1  ---      Ksc.msh   [0]? K median shape score (kscmsh)
     1882-1887  F6.1  %       Jchi.ellf  ? J chi-fraction for elliptical fit
                                         to 3{sigma} isophote (jchifellf)
     1889-1894  F6.1  %       Kchi.ellf  ? K chi-fraction for elliptical fit
                                         to 3{sigma} isophote (kchifellf)
        1896  I1    ---      ellfFlg   [0,1]? ellipse fitting contamination flag
                                         (0=no contamination) (ellfit_flg)
     1898-1903  F6.1  %       Schi.ellf  ? super-coadd chi-fraction for elliptical
                                         fit to 3{sigma} isophote (supchifellf)
    --------------------------------------------------------------------------------
     1905-1908  I4    ---      Nbln      [0]? Number of blanked sources (n_blank)
     1910-1913  I4    ---      Nsub      [0]? Number of subtracted sources (n_sub)
        1915  I1    ---      f_Nsub    [0]? blanked/subtracted description flag
                                          (blsubflg)
    --------------------------------------------------------------------------------
        1917  I1    ---      xid       [0,1] Type/galaxy source (id_flg) (7)
     1919-1938  A20   ---      idGal     Matched galaxy's catalog name (id_cat)
     1940-1945  A6    ---      fgFlg     [_] flux-growth convergence flag (fg_flg)
        1947  I1    ---      LCSBbf    [1]? LCSB blocking factor (1,2,4,8) (blk_fac)
        1949  I1    ---      dupSrc    [0,5] Duplicate source flag (dup_src) (8)
        1951  I1    ---      useSrc    [0,1] Use source flag (use_src) (9)
     1953-1957  F5.1  arcsec   prox      Distance to nearest neighbor in PSC (prox)
     1959-1961  I3    deg      pxpa      ? pos.angle of vector to prox (pxpa)
     1963-1972  I10   ---      pxKey     ext_key value of nearest XSC source (pxcntr)
     1974-1978  I5    arcsec   edge.ns   ? Distance to nearest N/S edge (distedgens)
     1980-1982  I3    arcsec   edge.ew   ? Distance to nearest E/W edge (distedgeew)
     1984-1985  A2    ---      edgeFlg   [nswe ] nearest edge (distedgeflg)
     1987-1996  I10   ---      ptsKey    ? Key to source data DB record (pts_key)
     1998-2002  I5    ---      mpKey     ? Key to minor planet prediction (mp_key)
     2004-2007  I4    ---      nightKey  ? key to night data record (night_key)
     2009-2014  I6    ---      scanKey   ? key to scan data record (scan_key)
     2016-2022  I7    ---      coaddKey  ? key to coadd data record (coadd_key)
        2024  A1    ---      hemis     [ns] hemisphere of observation:
                                         n = North/Mt.Hopkins; s= South/CTIO (hemis)
     2026-2035  A10 "YYYY-MM-DD" date    UT day of observation (date) (10)
     2037-2039  I3    ---      scan      ? scan number (unique within date) (scan)
     2041-2043  I03   ---      coadd     ? 3-digit coadd number (unique within scan)
                                         (coadd)
     2045-2050  I6    ---      ID        ? source ID number (unique within
                                         scan+coadd) (id)
     2052-2057  F6.1  arcsec   Xcoadd    ? x (cross-scan) position  (x_coadd)
     2059-2064  F6.1  arcsec   Ycoadd    ? y (in-scan) position  (y_coadd)
     2066-2071  F6.1  ---      Jsubst2   [0]? J residual background#2 score (j_subst2)
     2073-2078  F6.1  ---      Hsubst2   [0]? H residual background#2 score (h_subst2)
     2080-2085  F6.1  ---      Ksubst2   [0]? K residual background#2 score (k_subst2)
     2087-2092  F6.1  ---      Jbg       ? J coadd median background (j_back)
     2094-2099  F6.1  ---      Hbg       ? H coadd median background (h_back)
     2101-2106  F6.1  ---      Kbg       ? K coadd median background (k_back)
     2108-2114  F7.3  ---      Jres.ann  ? J residual annulus background median
                                         (jresidann)
     2116-2122  F7.3  ---      Hres.ann  ? H residual annulus background median
                                         (hresidann)
     2124-2130  F7.3  ---      Kres.ann  ? K residual annulus background median
                                         (kresidann)
     2132-2136  I5    arcsec   JbgPer    ? J banding FT period (jbndgper)
     2138-2143  F6.3  ---      JbgAmp    ? J banding maximum FT amplitude (jbndgamp)
     2145-2149  I5    arcsec   HbgPer    ? H banding FT period (hbndgper)
     2151-2156  F6.3  ---      HbgAmp    ? H banding maximum FT amplitude (hbndgamp)
     2158-2162  I5    arcsec   KbgPer    ? K banding FT period (kbndgper)
     2164-2169  F6.3  ---      KbgAmp    ? K banding maximum FT amplitude (kbndgamp)
     2171-2174  F4.1  ---      Jtrack    ? J band seetracking score (j_seetrack)
     2176-2179  F4.1  ---      Htrack    ? H band seetracking score (h_seetrack)
     2181-2184  F4.1  ---      Ktrack    ? K band seetracking score (k_seetrack)
     2186-2194  I9    ---      extKey    entry counter (key) number (ext_key)

    Note (1): Julian date of the source measurement is accurate to ±3
         minutes. This value is the mean Julian date of the scan observation
         in which this source falls.
    Note (2): The confusion flags are defined as follows:
          0 = no other sources within aperture used
          1 = aperture contained pixels masked off in coadd
          2 = aperture contained pixels masked off due to neighboring sources
          3 = aperture contained pixels that had a point source flux subtracted off
          4 = aperture contained pixels within bright star mask
          5 = aperture contained pixels masked off due to persistence
          6 = aperture ran into coadd boundary
          7 = aperture contained pixels within bright galaxy mask
          9 = integrated flux is negative
        If the integrated flux is negative, a mag value is calculated using
           BFMag = 99.0 - [ZERO_CAL - 2.5 log10(|flux|)];
        the resulting mag range is between ~ 75 and 99.
    Note (3): the concentration index is the ratio of effective radius at 75%
         and 25% of the light, r(75%)/r(25%)
    Note (4): score in the range 1(extended) < score < 2(point-like).

    Note (5): the visual verification score gives the source type of sources
              examined "by eye", as follows:
         -2 = unknown
         -1 = no verification (i.e., not examined)
          1 = galaxy
          2 = non-extended (e.g., star, double, triple, artifact)
    Note (6): The contamination/confusion flag indicates whether the source's
         photometry and position may be affected by artifacts of, or confusion
         with, nearby bright stars.  Sources are tested for contamination
         and/or confusion in the order given below, and once a flag is applied
         to the source, testing is stopped in that band. The flag values
         indicate the source may be:
         U =  unreliable source; probable image artifact detection (none)
         C =  affected by confusion with or artifact of a nearby bright star (none)
         A or a =  known artifacts
         z =  in close proximity to a large galaxy; these sources are usually junk
         Z =  Derived from the Large Galaxy Atlas
         0 =  default value -- not contaminated
    Note (7): flag indicating the extended source catalog type as follows:
          0 = extended source not found in another catalog
          1 = extended source is found in galaxy catalog
              (ID found in idGal field)
          2 = LCSB (Low Central Surface Brightness) source
    Note (8): Duplicate source flag, used in conjunction with the useSrc flag.
         This numerical flag indicates whether the source falls in a Tile
         overlap region, and if so, if it was detected multiple times.
         0 = the source does not fall within a Tile overlap region
             (useSrc=1), or it falls in an overlap region and there were
              no sources detected within 2" of its position in the
              overlapping Tile (useSrc=0).
         1 = the source falls within a Tile overlap region, and there is one
             source detected within 2" of its position in the overlapping Tile.
        >1 = the source falls within a Tile overlap region, and there are
             multiple sources detected within 2" of its position in the
             overlapping Tile, and/or within its own Tile. This implies
             confusion in the multiple source resolution procedure.
    Note (9): Use source flag, used in conjunction with the dupSrc flag.
         This numerical flag indicates if a source falls within a Tile overlap
         region, and whether or not it satisfies the unbiased selection rules
         for multiple source resolution.
         0 = the source falls in a Tile overlap region, but does not have a
             detection within 2" of its position in any overlapping Tiles.
             PSC sources with useSrc=0 will always have dupSrc=0. Such objects
             are usually faint, and thus toggling above and below the detection
             limits, or may have moved between the scans of the different Tiles.
         1 = The source does not fall in a Tile overlap region (dupSrc=0), or
             it falls in an overlap region, but lies farther from its scan edge
             than any apparition of the source in another Tile. A source must
             have useSrc=1 to be considered part of the sub-Catalog that
             satisfies the 2MASS Level 1 Science Requirements
        >1 = The source falls within a Tile overlap region, and there are
             multiple sources detected within 2" of its position in the
             overlapping Tile, and/or within its own Tile. This implies
             confusion in the multiple source resolution procedure.
    Note (10):
         The observation reference date for this source expressed in ISO
         standard format. This is the UT day value at sunrise for the night on
         which the source was observed. Because it is possible for the UT day
         to change during a night of observations, the actual UT date for a
         source measurement can differ from date by one day. Use the Julian Day
         value (jdate) for a more accurate determination of the observation
         time of the source.
    Note (11):
         The system flux includes the flux from this extended source and
         anything else in the immediate area, including stars and neighboring
         galaxies that "touch" this source.

    Nomenclature Notes:
         The recommended naming of the 2MASS Extended Sources Catalog
         is 2MASX JHHMMSSss+DDMMSSs, i.e. adding a 'J' to formalize the
         expression of the position in the J2000 system.

    History:
        From DVD-ROMs of 2MASS catalogues
    ================================================================================
    (End)                                   Francois Ochsenbein [CDS]    29-Apr-2003