SUOP2 - do a binary operation on two data sets			

 suop2 data1 data2 op=diff >stdout					

 Required parameters:							
 	none								

 Optional parameter:							
 	op=diff		difference of two panels of seismic data	
 			=sum  sum of two panels of seismic data		
 			=prod product of two panels of seismic data	
 			=quo quotient of two panels of seismic data	
 			=ptdiff differences of a panel and single trace	
 			=ptsum sum of a panel and single trace		
 			=ptprod product of a panel and single trace	
 			=ptquo quotient of a panel and single trace	

 Note1: Output = data1 "op" data2 with the header of data1		

 Note2: For convenience and backward compatibility, this		
 	program may be called without an op code as:			

 For:  panel "op" panel  operations: 				
 	susum  file1 file2 == suop2 file1 file2 op=sum			
 	sudiff file1 file2 == suop2 file1 file2 op=diff			
 	suprod file1 file2 == suop2 file1 file2 op=prod			
 	suquo  file1 file2 == suop2 file1 file2 op=quo			

 For:  panel "op" trace  operations: 				
 	suptsum  file1 file2 == suop2 file1 file2 op=ptsum		
 	suptdiff file1 file2 == suop2 file1 file2 op=ptdiff		
 	suptprod file1 file2 == suop2 file1 file2 op=ptprod		
 	suptquo  file1 file2 == suop2 file1 file2 op=ptquo		

 Note3: If an explicit op code is used it must FOLLOW the		
	filenames.							

 Note4: With op=quo and op=ptquo, divide by 0 is trapped and 0 is returned.

 Note5: Weighted operations can be specified by setting weighting      
        coefficients for the two datasets:                             
        w1=1.0                                                         
        w2=1.0                                                 

 For operations on non-SU binary files  use:   farith 		

 Credits:
	SEP: Shuki Ronen
	CWP: Jack K. Cohen
	CWP: John Stockwell, 1995, added panel op trace options.

 Notes:
	If efficiency becomes important consider inverting main loop
      and repeating operation code within the branches of the switch.