SU3DCHART - plot x-midpoints vs. y-midpoints for 3-D data	

 su3dchart <stdin >stdout					

 Optional parameters:						
 outpar=null	name of parameter file				
 degree=0	=1 convert seconds of arc to degrees		

 The output is the (x, y) pairs of binary floats		

 Example:							
 su3dchart <segy_data outpar=pfile >plot_data			
 psgraph <plot_data par=pfile \\				
	linewidth=0 marksize=2 mark=8 | ...			
 rm plot_data 							

 su3dchart <segy_data | psgraph n=1024 d1=.004 \\		
	linewidth=0 marksize=2 mark=8 | ...			

 Note:  sx, etc., are declared double because float has only 7
 significant numbers, that's not enough, for example,    
 when tr.scalco=100 and coordinates are in second of arc    
 and located near 30 degree latitude and 59 degree longitude           
                                                            


 Credits:
	CWP: Shuki Ronen
	Toralf Foerster

 Trace header fields accessed: sx, sy, gx, gy, counit, scalco.