SUXCONTOUR - X CONTOUR plot of Seismic UNIX tracefile via vector plot call

 suxwigb <stdin [optional parameters] | ...				

 Optional parameters:						 	
 key=(keyword)		if set, the values of x2 are set from header field
			specified by keyword				
 n2=tr.ntr or number of traces in the data set	(ntr is an alias for n2)
 d1=tr.d1 or tr.dt/10^6	sampling interval in the fast dimension	
   =.004 for seismic 		(if not set)				
   =1.0 for nonseismic		(if not set)				
 d2=tr.d2			sampling interval in the slow dimension	
   =1.0 			(if not set)				
 f1=tr.f1 or tr.delrt/10^3 or 0.0  first sample in the fast dimension	
 f2=tr.f2 or tr.tracr or tr.tracl  first sample in the slow dimension	
   =1.0 for seismic		    (if not set)			
   =d2 for nonseismic		    (if not set)			

 verbose=0              =1 to print some useful information		

 tmpdir=	 	if non-empty, use the value as a directory path	
		 	prefix for storing temporary files; else if the	
	         	the CWP_TMPDIR environment variable is set use	
	         	its value for the path; else use tmpfile()	

 Note that for seismic time domain data, the "fast dimension" is	
 time and the "slow dimension" is usually trace number or range.	
 Also note that "foreign" data tapes may have something unexpected	
 in the d2,f2 fields, use segyclean to clear these if you can afford	
 the processing time or use d2= f2= to override the header values if	
 not.									

 If key=keyword is set, then the values of x2 are taken from the header
 field represented by the keyword (for example key=offset, will show   
 traces in true offset). This permit unequally spaced traces to be plotted.
 Type   sukeyword -o   to see the complete list of SU keywords.	

 This program is really just a wrapper for the plotting program: xcontour
 See the xcontour selfdoc for the remaining parameters.		


 
 Credits:

	CWP: Dave Hale and Zhiming Li (xwigb, etc.)
	   Jack Cohen and John Stockwell (suxwigb, etc.)
      Delphi: Alexander Koek, added support for irregularly spaced traces
      Aarhus University: Morten W. Pedersen copied everything from the xwigb
                         source and just replaced all occurencies of the word
                         xwigb with xcountour ;-)

 Notes:
	When the number of traces isn't known, we need to count
	the traces for xcontour.  You can make this value "known"
	either by getparring n2 or by having the ntr field set
	in the trace header.  A getparred value takes precedence
	over the value in the trace header.

	When we must compute ntr, we don't allocate a 2-d array,
	but just content ourselves with copying trace by trace from
	the data "file" to the pipe into the plotting program.
	Although we could use tr.data, we allocate a trace buffer
	for code clarity.