Level 2 Help for CCDSLOPE

 STRING COUNT=1
 The Light Transfer File created by LTGEN and MOMGEN containing area statistics
 for calculating the slope and offset.

 STRING--OPTIONAL
 Mark formated tiepoint data set containing (line,sample) locations of centers
 of all rejected areas (see REJECT parameter).

 STRING-OPTIONAL
 Specifies shutter-offset file (as generated by program CCDRECIP) containing
 the shutter-offsets for each line or sample of the image.  These
 shutter-offsets are used to correct for differences between the actual and
 commanded exposures.  If the OFFSETS parameter is not specified, then a
 mean shutter offset is used (see MOFSET parameter).

 REAL--OPTIONAL
 The mean shutter offset as determined by CCDRECIP.
 If line- or sample-dependent shutter offsets are input via the OFFSETS
 parameter, then the mean shutter offset is computed by averaging these
 offsets (overriding the MOFSET parameter).

 Integer--Optional
 Tolerance for Sigma Rejection from the mean values.
 Default SIGTOL=2.

 Keyword--Optional
 Specifies if the dark current is to be subtracted.
 If the keyword SUBDC is enabled, the dark current is subtracted from the
 mean DN at each exposure.  If extended exposure frames exist, then the
 extended exposure dark current is subtracted the the mean DN's at these
 exposures.
 Default is --, i.e., NO Dark Current Subtraction.

 Integer--Optional
 If extended exposure frames exist, the EXTEXPO parameter must normally be
 specified to indicate the exposure level at which the extended exposures
 begin.  For example, EXTEXPO=7 specifies that the 7th exposure level (above
 the dark current) begins the extended exposures.
 Default is EXTEXPO=30

 Integer--Optional
 The value of REJECT specifies how the "bad areas" shall be rejected:
   REJECT=0  No area rejection applied
   REJECT=1  Reject areas with bad slopes
   REJECT=2  Reject areas with bad offsets
   REJECT=3  Reject areas with either bad slope or offset
 The Default is REJECT=1.

 Keyword--Optional
 If the keyword DELTAX is specified, the processing steps are repeated
 after adjusting the energy levels so that the resulting curve passes
 through the origin.  This is accomplished by adding the ratio OFFSET/SLOPE
 to each energy term.

 String--Optional
 If PLOT filename is specified, a plot of mean DN vs input light energy will
 be generated.  The plot is generated for the four corners and center of the
 frame, and for the entire frame.

 String--Optional
 Output plot format
 GNUPLOT or EPS

 Keyword--Optional
Specifies whether the illumination value is in LUMINANC (Relative-Foot-
Lamberts ) or RADIANCE (picoamp).
(UNITS should be LUMINANC for Galileo and RADIANCE for Cassini).

 Real--Optional
 A light intensity scaling parameter in units of Relative Foot Lamberts
 (UNITS= LUMINANC) or  picoamp (UNITS=RADIANCE))
 Typical value is on the order of ~1.  This value describes the incident
 light energy present during the Light Transfer test.  This value may be
 read from the label of the Light Transfer File, but will be overridden by
 the value given by parameters.

 String--Optional
 If TABLE an output table of plot data will be written to the file specified.
 The table is tab-delimitted ASCII text.  It contains data for the four
 corners, the center of the frame, and for the entire frame.  It lists Mean_DN,
 Computed_DN, and Energy for each exposure level.