Contains a record describing the each mask object

maskIDbigint8 ID_CATALOGUnique Id number, composed of skyversion, rerun, run, camcol, field, filter, mask
runsmallint2 OBS_RUNRun number
rerunsmallint2 CODE_MISCRerun number
camcoltinyint1 INST_IDCamera column
fieldsmallint2 ID_FIELDField number
masksmallint2 ID_NUMBERThe object id within a field. Usually changes between reruns of the same field.
filtertinyint1 INST_IDThe enumerated filter [0..4]
rafloat8degPOS_EQ_RA_MAINJ2000 right ascension (r')
decfloat8degPOS_EQ_DEC_MAINJ2000 declination (r')
radiusfloat8degEXTENSION_RADthe radius of the bounding circle
areavarchar4096 EXTENSIONArea descriptor for the mask object
typeLink to MaskTypeint4 CLASS_CODEenumerated type of mask
seeingreal4arcsecsINST_SEEINGseeing width
cxfloat8 POS_EQ_CART_Xunit vector for ra+dec
cyfloat8 POS_EQ_CART_yunit vector for ra+dec
czfloat8 POS_EQ_CART_Zunit vector for ra+dec
htmIDbigint8 CODE_HTM20-deep hierarchical trangular mesh ID of this object