sulog.su.main

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 SULOG -- time axis log-stretch of seismic traces		

 sulog [optional parameters] <stdin >stdout 			

 Required parameters:						
	none				 			

 Optional parameters:						
	ntmin= .1*nt		minimum time sample of interest	
	outpar=/dev/tty		output parameter file, contains:
				number of samples (nt=)		
				minimum time sample (ntmin=)	
				output number of samples (ntau=)
	m=3			length of stretched data	
				is set according to		
					ntau = nextpow(m*nt)	
	ntau= pow of 2		override for length of stretched
				data (useful for padding zeros	
				to avoid aliasing)		

 NOTES:							
	ntmin is required to avoid taking log of zero and to 	
	keep number of outsamples (ntau) from becoming enormous.
        Data above ntmin is zeroed out.			

	The output parameters will be needed by suilog to 	
	reconstruct the original data. 				

 EXAMPLE PROCESSING SEQUENCE:					
		sulog outpar=logpar <data1 >data2		
		suilog par=logpar <data2 >data3			


 Credits:
	CWP: Shuki, Chris

 Caveats:
 	Amplitudes are not well preserved.

 Trace header fields accessed: ns, dt
 Trace header fields modified: ns, dt