SUIMP2D - generate shot records for a line scatterer	
           embedded in three dimensions using the Born	
	    integral equation				",							

 suimp2d [optional parameters] >stdout			

 Optional parameters					
	nshot=1		number of shots			
	nrec=1		number of receivers		
	c=5000		speed				
	dt=.004		sampling rate			
	nt=256		number of samples		
	x0=1000		point scatterer location	
	z0=1000		point scatterer location	
	sxmin=0		first shot location		
	szmin=0		first shot location		
	gxmin=0		first receiver location		
	gzmin=0		first receiver location		
	dsx=100		x-step in shot location		
	dsz=0	 	z-step in shot location		
	dgx=100		x-step in receiver location	
	dgz=0		z-step in receiver location	

 Example:						
	suimp2d nrec=32 | sufilter | supswigp | ...	


 Credits:
	CWP: Norm Bleistein, Jack K. Cohen


 Theory: Use the 3D Born integral equation (e.g., Geophysics,
 v51, n8, p1554(7)). Use 2-D delta function for alpha and do
 remaining y-integral by stationary phase.

 Note: Setting a 2D offset in a single offset field beats the
       hell out of us.  We did _something_.

 Trace header fields set: ns, dt, tracl, tracr, fldr, sx, selev,
                          gx, gelev, offset