diffObjID	dimensionless 	BIGINT 	8 	NA 	diff object identifier
diffgcObjID		dimensionless	BIGINT	8	  NA 	ODM galactic coordinates identifier
diffDetID 	dimensionless 	BIGINT 	8 	NA 	diff detection identifier
diffDetMetaID 	dimensionless 	BIGINT 	8 	NA 	diff detection meta identifier
ippDetectID 	dimensionless 	BIGINT 	8 	NA 	ipp detection id generated by IPP
ippObjID 	dimensionless 	BIGINT 	8 	NA 	ipp object id generated by IPP
filterID 	dimensionless 	TINYINT	1 	NA 	filter ID: g=1, r=2, i=3, z=4, y=5, w=6, ...
surveyID 	dimensionless 	TINYINT	1 	NA 	survey flag identifierr
randomDiffID 	dimensionless 	BIGINT 	8 	NA 	random diff id  
skyCellID       dimensionless   REAL    4       -999    single float giving PrimaryCell.SkyCell identifier 
dvoRegionID     dimensionless   REAL    4       -999    identifier to dvo spatial region
obsTime 	MeanJulianDays 	FLOAT 	8 	-999 	Time of mid observation of positive detection in Mean Julian Days of positive detection
xPos 		pixels 		REAL 	4 	-999 	measured x on diff image sky cell PSF fit
yPos 		pixels 		REAL 	4 	-999 	measured y on diff image sky cell from PSF fit
xPosErr 	pixels 		REAL 	4 	-999 	estimated error in x
yPosErr 	pixels 		REAL 	4 	-999 	estimated error in y
pltScale        arcsec/pix      REAL    4       -999    plate scale at this location (from DVO)
posAngle        degrees         REAL    4       -999    position angle (sky-to-chip) at this location (from DVO)
----------------------------------------------------    next 8 came from old DiffDetCalib, zp derived from cpt tables of BOTH images 
ra              degrees         FLOAT   8       NA      Right Ascension
dec             degrees         FLOAT   8       NA      Declination
raErr           arcsec          REAL    4       NA      Right Ascension error -> posErr because RA,Dec same?
decErr          arcsec          REAL    4       NA      Declination error
zp              magnitude       REAL    4       0       zeropoint (all that is needed to convert adu/sec to AB mag), no zpErr
telluricExt     magnitude       REAL    4       NA      estimated extinction due to non-photometric conditions  
expTime         seconds         REAL    4       -999    exposure time (informational)
airMass         dimensionless   REAL    4       0       airmass (informational)
-----------------------------------------------------   attributes of positive detection
psfFlux 	adu/seconds 	REAL 	4 	-999 	PSF instrumental flux (in analog-to-digital units/sec) or adu/sec
psfFluxErr 	adu/seconds 	REAL 	4 	-999 	estimated error in flux
psfMajorFWHM    arcsec          REAL    4       -999    model PSF width in major axis
psfMinorFWHM    arcsec          REAL    4       -999    model PSF width in minor axis
psfTheta        degrees         REAL    4       -999    model PSF orientation angle degrees East of North
psfCore         dimensionless   REAL    4       -999    model PSF core parameter [k in (1 + kz + z^1.66)]
psfQf 		dimensionless 	REAL 	4 	-999 	PSF coverage factor
psfQfPerfect 	dimensionless 	REAL 	4 	-999 	PSF-weighted fraction of pixels totally unmasked
psfChiSq 	dimensionless 	REAL 	4 	-999 	reduced-chisq of the psf model fit. (ndof?, npix?)
psfLikelihood 	dimensionless 	REAL 	4 	-999 	PSF likelihood
momentXX 	arcsec^2     	REAL 	4 	-999 	moment XX
momentXY 	arcsec^2     	REAL 	4 	-999 	moment XY
momentYY 	arcsec^2     	REAL 	4 	-999 	momeny YY
momentR1 	arcsec       	REAL 	4 	-999 	first radial moment 
momentRH 	arcsec       	REAL 	4 	-999 	half light radius  
momentM3C 	arcsec^3     	REAL 	4 	-999 	3rd moment sin(theta) 
momentM3S 	arcsec^3     	REAL 	4 	-999 	3rd moment cos(theta) 
momentM4C 	arcsec^4     	REAL 	4 	-999 	4th moment sin(theta)
momentM4S  	arcsec^4     	REAL 	4 	-999 	4th moment cos(theta) 
apFlux 		adu/seconds 	REAL 	4 	-999 	Aperture flux
apFluxErr 	adu/seconds 	REAL 	4 	-999 	Aperture flux error
apFillF         dimensionless   REAL    4       -999    Aperture fill factor 
kronFlux 	adu/seconds 	REAL 	4 	-999 	Kron flux
kronFluxErr 	adu/seconds 	REAL 	4 	-999 	Kron flux error
kronRad 	raw pixels 	REAL 	4 	-999 	Kron radius
kronRadErr 	raw pixels 	REAL 	4 	-999 	Kron radius error
------------------------------------------------------- from diff image cmf/smf files 
diffNPos        dimensionless   REAL    4       -999    npix > 3sigma
diffFRatio      dimensionless   REAL    4       -999    fPos/(fPos +fNeg)
diffNBad        dimensionless   REAL    4       -999    nPos/(nPos+nNeg)
diffNMask       dimensionless   REAL    4       -999    nPos/(nPos + nMask)
diffNAll        dimensionless   REAL    4       -999    nPos/(nPos + nMask + nNeg)
diffPdist       arcsec          REAL    4       -999    distance to positive match source
diffNdist       arcsec          REAL    4       -999    distance to negative match source
diffPSN         dimensionless   REAL    4       -999    signal to noise of pos match source
diffNSN         dimensionless   REAL    4       -999    signal to noise of neg match source
-------------------------------------------------------
sky 		adu/sec/pixel 	REAL 	4 	-999 	PSF sky level at source
skyErr 		adu/sec/pixel 	REAL 	4 	-999 	estimated error in sky
infoFlag 	dimensionless 	BIGINT 	8 	-999 	flag indicating provenance information
dataRelease 	dimensionless 	TINYINT	1 	NA 	Data release when this detection was originally taken. Recalibrations do not affect this value.
