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			       SA

      SADMASK is a module which operates via a mask file on a given map to 
 set pixel values to either their original value or to zero.  The output can 
 be written to the original map or to a new one.  At every point in the 
 mask file where a zero value exists, a zero will be written to the output
 file.  At every point in the mask file where a nonzero value exists, the
 original value in the given file will be written to the output file.
 This is useful when repeated operations in galaxy photometry need to be 
 done. 

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 Enter an option:                              13-NOV-1991 12:15:35.03
 OPTION=SA                                                                  
 SADMASK, Version 1
 Open the SAD file to be operated on
 Enter the filename:  (<CR> for default)
 READ_FILE=E022152
 There is one map in the file
 Reading from the file
  512 rows of  320 pixels in R4 format
 Open the SAD file to be used as a mask
 Enter the filename:  (<CR> for default)
 MASK_FILE=MASK
 There is one map in the file
 Reading from the file
  512 rows of  320 pixels in R4 format
 Open the output file
 Enter the filename:  (<CR> for default)
 WRITE_FILE=E022152_A		....The output file is automatically made
				    the same size.
 Creating new file
				....The operation is now taking place
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