Catalogs description

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ra	Right Ascension at reference epoch [deg]
dec	Declination at reference epoch [deg]
Ks	Ks band magnitude
J	J band magnitude
pmRA	Proper motion in the R.A. direction [mas/yr]
epmRA	pmRA error [mas/yr]
pmDEC	Proper motion in the DEC. direction [mas/yr]
epmDEC	pmDEC error [mas/yr]
nfitX	Number of points used to fit pmX, with X = RA, DEC
tfitX	Time baseline used in the pmX fit, with X = RA, DEC [years]
QFIT	PSF quality of fit parameter for Ks band from KS2
ok	Flag equal to one for selected sources that passed the quality cuts described below
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The reference epoch for the position of each catalog is specified in the header of the catalog.
Sources with no measured proper motion are flagged with the value 999 for both proper motion and proper motion error.
Sources with no J magnitude are flagged with 999.

Sources with ok = 0 are not reliable and should be carefully checked.

Quality cuts:
- Source measured in at least 4 images
- QFIT > 0
- nfitX > 20
- abs(pmX) < 847.5/tfitX (847.5 = 2.5 px * 339 mas/px, where 2.5 is the maximum matching radius adopted)
- epmX > 0
- ePM < 5 or abs(ePM/PM) < .1 (total proper-motion error less than 5 OR less than 10%)