STRUCT       PhotCode
EXTNAME      DVO_PHOTCODE
TYPE         BINTABLE
SIZE         80
DESCRIPTION  DVO Photcode Description Table 

# elements of data structure / FITS table
FIELD  code,        CODE,        unsigned short, code number (stored in Measure.source) 
FIELD  name,        NAME,        char[32],	 name for filter combination 
FIELD  type,        TYPE,        char,	      	 PRI/SEC/DEP/REF 
FIELD  dummy,       DUMMY,       char[3],        padding
FIELD  C,           C_LAM,       short,	      	 primary phot calibration terms (millimags) 
FIELD  dC,          C_LAM_ERR,   short,	      	 primary phot calibration terms (millimags) 
FIELD  dX,          X_ERR,       short,	      	 primary phot calibration terms (millimags) 
FIELD  K,           K,           float,	      	 secondary phot calibration terms (millimags) 
FIELD  c1,          C1,          int,	      	 color is average.M[c1] - average.M[c2] 
FIELD  c2,          C2,          int,	      	 color is average.M[c1] - average.M[c2] 
FIELD  equiv,       EQUIV,       int,	      	 this dependent filter is equivalent to equiv PRI/SEC
FIELD  Nc,          NC,          int,	      	 number of color terms 
FIELD  X,           X,           float[4],    	 color terms $X[0]*mc + X[1]*mc^2 + X[2]*mc^3$, etc 
