Parameters

 Keyword  Position  Type       Description
 -------  --------  ----       -----------
 SOURCE      1      UNIV       Name of source file
 BCKGND      2      UNIV       Name of background file
 OUT         3      UNIV       Name of output file
 RTNAME             CHARACTER  Rootname of calibration files
 ENERGY             REAL       Mean photon energy
 UPPEN              REAL       Maximum energy for applying position
                               corrections (keV)
 AXTYPE             INTEGER    Type of axis  e.g. X,Y,time,PH
                               Only if an axis is not recognised.
 EFFILE             CHARACTER  Effective area file.
 RESPFILE           CHARACTER  Detector response matrix file
 PCORR              LOGICAL    Correct the background to the source
                               position before subtracting ?
    Hidden default = YES
 PARTICLES          LOGICAL    Calculate the particles and modify the
                               vignetted counts accordingly ?
    Hidden default = YES
 PART_FILE          CHARACTER  Name of output particle spectrum file
                               "!" means don't produce a file
                               NB: This produces the particle spectrum
                               in the background box
    Hidden default = !
 SDEFVAR            REAL       Variance to assign to empty source
                               pixels
    Hidden default = 0
 BDEFVAR            REAL       Variance to assign to empty background
                               pixels
    Hidden default = 0
 BGMODEL            CHARACTER  Name of file to contain the actual
                               background subtracted from the source
                               file. "!" means don't produce a file.
                               Useful if maximum likelihood fitting.
    Hidden default = !