SUAMP - output amp, phase, real or imag trace from		
 	(frequency, x) domain data				

 suamp <stdin >stdout mode=amp					

 Required parameters:						
 	none							

 Optional parameter:						
 	mode=amp	output flag		 		
 	       		amp   = output amplitude traces		
 	       		phase = output phase traces		
 	       		real  = output real parts		
 	       		imag  = output imag parts 		

 Note:								
 	The trace returned is half length from 0 to Nyquist. 	

 Example:							
 	sufft <data | suamp >amp_traces				


 Credits:
	CWP: Shuki, Jack

 Notes:
	If efficiency becomes important consider inverting main loop
      and repeating extraction code within the branches of the switch.

 Trace header fields accessed: ns, trid
 Trace header fields modified: ns, trid