suztot.su.main

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 SUZTOT - resample from depth to time					

 suztot <stdin >stdout [optional parms]				

 Optional Parameters:							
 nt=1+(nz-1)*2.0*dz/(vmax*dt)    number of time samples in output	
 dt=2*dz/vmin		time sampling interval (defaults avoids aliasing)
 ft=2*fz/v(fz)		first time sample				
 z=0.0,...		depths corresponding to interval velocities in v
 v=1500.0,...		interval velocities corresponding to depths in v
 vfile=		binary (non-ascii) file containing velocities v(z)
 verbose=0		>0 to print depth sampling information		

 Notes:								
 Default value of nt set to avoid aliasing				
 The z and v arrays specify an interval velocity function of depth.	

 Note that z and v are given  as arrays of floats separated by commas,  
 for example:								
 z=0.0,100,200,... v=1500.0,1720.0,1833.5,... with the number of z values
 equaling the number of v values.					

 Linear interpolation and constant extrapolation is used to determine	
 interval velocities at times not specified.  Values specified in z	
 must increase monotonically.						

 Alternatively, interval velocities may be stored in a binary file	
 containing one velocity for every time sample.  If vfile is specified,
 then the z and v arrays are ignored.					

 see the selfdoc of   suttoz  for time to depth conversion		
 Trace header fields accessed:  ns, dt, and delrt			
 Trace header fields modified:  trid, ns, d1, and f1			


 Credits:
	CWP: John Stockwell, 2005, 
            based on suttoz.c written by Dave Hale c. 1992