SUCHART - prepare data for x vs. y plot			

 suchart <stdin >stdout key1=sx key2=gx			

 Required parameters:						
 	none							

 Optional parameters:						
 	key1=sx  	abscissa 				
 	key2=gx		ordinate				
	outpar=null	name of parameter file			

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

 Examples:							
 suchart <segy_data outpar=pfile >plot_data			
 psgraph <plot_data par=pfile title="CMG" \\			
	linewidth=0 marksize=2 mark=8 | ...			
 rm plot_data 							

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



 Credits:
	SEP: Einar Kjartansson
	CWP: Jack K. Cohen

 Notes:
	The vtof routine from valpkge converts values to floats.