SUMIGGBZO - MIGration via Gaussian Beams of Zero-Offset SU data	

 sumiggbzo <infile >outfile vfile=  nz= [optional parameters]		

 Required Parameters:							
 vfile=                 name of file containing v(x,z)			
 nz=                    number of depth samples			

 Optional Parameters:							
 dt=from header		time sampling interval			
 dx=from header(d2) or 1.0	spatial sampling interval		
 dz=1.0                 depth sampling interval			
 fmin=0.025/dt          minimum frequency				
 fmax=10*fmin           maximum frequency				
 amin=-amax             minimum emergence angle; must be > -90 degrees	
 amax=60                maximum emergence angle; must be < 90 degrees	
 bwh=0.5*vavg/fmin      beam half-width; vavg denotes average velocity	

 Note: spatial units of v(x,z) must be the same as those on dx		


 Credits:

	CWP: Dave (algorithm), Jack and John (reformatting for SU)