Help for SIGNAL

PURPOSE:
   Signal is a VICAR applications program which outputs the signal of a specific
pixel from a set of flat-field image.  The exposure and signal is output into
an ASCII text file.  If the input images are PICSUM'd, then the value of the
pixel specified by LS is divided by the PISCALE value that is in the VICAR
label.  If there is no PICSCALE value, then the input is assumed not to be
PICSUM'd.

This program was written for the Cassini ISS camera and expects that the
flat-field images have a valid Cassini label.

EXECUTION STATEMENT:

  SIGNAL INP=(D1,D2,D3,...,Dn) TBL=SIGNAL.TBL LS=(100,201)

     or

  SIGNAL LIST=FILENAME.LIST TBL=SIGNAL.TBL LS=(100,201)

The flat-field filenames may be input to the program in the form of a
SRCH-format text file (see program NXT).  The output TBL produces a
tab-delimited ASCII text file containing EXPOSURE and SIGNAL.

RESTRICTIONS:

1.  A maximum of 50 exposure levels are allowed.

PROGRAM HISTORY:

Written by Jan Yoshimizu, 17 Nov 95
Current cognizant programmer:  Jan Yoshimizu
Revisions:
   28 JUL 97  RRD  Made portable for UNIX
		   Made computation of signal float division
   17 NOV 95  JRY  Initial release

PARAMETERS: