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  SUKDMDCR - 2.5D datuming of receivers for prestack, common source    
            data using constant-background data mapping formula.       
            (See selfdoc for specific survey requirements.)            

    sukdmdcr  infile=  outfile=  [parameters] 	         		

 Required file parameters:						
 infile=stdin		file for input seismic traces			
 outfile=stdout	file for output          			
 ttfile=		file for input traveltime tables		

 Required parameters describing the traveltime tables:		        
 fzt= 			first depth sample in traveltime table		
 nzt= 			number of depth samples in traveltime table	
 dzt=			depth interval in traveltime table		
 fxt=			first lateral sample in traveltime table	
 nxt=			number of lateral samples in traveltime table	
 dxt=			lateral interval in traveltime table		
 fs= 			x-coordinate of first source in table		
 ns= 			number of sources in table			
 ds=			x-coordinate increment of sources in table	

 Parameters describing the input data:                                 
 nxso=                  number of shots                                 
 dxso=                  shot interval                                   
 fxso=0                x-coordinate of first shot                      
 nxgo=                  number of receiver offsets per shot             
 dxgo=                  receiver offset interval                        
 fxgo=0                first receiver offset                           
 dt= or from header (dt)       time sampling interval of input data    
 ft= or from header (ft)       first time sample of input data         

 Parameters describing the domain of the problem:             		
 dzo=0.2*dzt		vertical spacing in surface determination       
 offmax=99999		maximum absolute offset allowed          	

 Parameters describing the recording and datuming surfaces:            
 recsurf=0             recording surface (horizontal=0, topographic=1) 
 zrec=                  defines recording surface when recsurf=0        
 recfile=              defines recording surface when recsurf=1        
 datsurf=0             datuming surface (horizontal=0, irregular=1)    
 zdat=                 defines datuming surface when datsurf=0         
 datfile=              defines datuming surface when datsurf=1         

 Optional parameters describing the extrapolation:                     
 aperx=nxt*dxt/2  	lateral half-aperture 				
 v0=1500(m/s)		reference wavespeed               		
 freq=50               dominant frequency in data, used to determine   
                       the minimum distance below the datum that       
                       the stationary phase calculation is valid.      
 scale=1.0             user defined scale factor for output            
 jpfile=stderr		job print file name 				
 mtr=100  		print verbal information at every mtr traces	
 ntr=100000		maximum number of input traces to be datumed	



 Computational Notes:                                                
   
 1. Input traces must be SU format and organized in common shot gathers.

 2. Traveltime tables were generated by program rayt2d (or equivalent)