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			     AD

      ADDSUB is a module which adds and/or subtracts maps within one SAD 
 file and writes the result to the same or a different file.  Adding and
 subtracting maps from one file is an operation which option AR
 cannot do.

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 Enter an option:                               7-NOV-2000 11:19:51.34
 OPTION=AD
 ADDSUB, Version 2
 Open the input file
 Enter the filename:  (<CR> for default)
 FILE=SPECTRUM3
 There are   5 maps in the file       
 Reading from the file
   16 rows of 1024 pixels in R4 format
 Open the output file
 NMAPS=    1 NPLNS=    1 NROWS=    16 NELS=  1024
 Enter the filename:  (<CR> for default)           !  We could also write to
 FILE=                                             !  a new file
 SPECTRUM3                               
 Writing to an existing file
 There are   5 maps in the file       
 Enter the map number:  (default = one after the last map)
 MAP=
          6
 Creating new map
   16 rows of 1024 pixels in R4 format
 Enter the map numbers of the maps to be added:  (default = none)
 MAPS_ADDED=1 3 
 Enter their multipliers:  (default = 1.0)
 ADD_FACTOR=
   1.00000    
   1.00000    
 Enter the map numbers of the maps to be subtracted:  (default = none)
 MAPS_SUBTRACTED=2 4
 Enter their multipliers:  (default = 1.0)
 SUBTRACT_FACTOR=
   1.00000    
   1.00000    

 Enter an option:                               7-NOV-2000 11:21:06.29
 OPTION=PH
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