SUPSCONTOUR - PostScript CONTOUR plot of a segy data set		

 supscontour <stdin [optional parameters] | ...			

 Optional parameters:						 	

 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.									

 See the pscontour selfdoc for the remaining parameters.		

 On NeXT:	supscontour < infile [optional parameters]  | open	

 Trace header fields accessed: ns, ntr, tracr, tracl, delrt, trid,     
	dt, d1, d2, f1, f2						

 Credits:

	CWP: Dave Hale and Zhiming Li (pscontour, etc.)
	   Jack Cohen and John Stockwell (supscontour, 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

 Notes:
	When the number of traces isn't known, we need to count
	the traces for pscontour.  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 do have to count the traces, we use the "tmpfile"
	routine because on many machines it is implemented
	as a memory area instead of a disk file.

	If your system does make a disk file, consider altering
	the code to remove the file on interrupt.  This could be
	done either by trapping the interrupt with "signal"
	or by using the "tmpnam" routine followed by an immediate
	"remove" (aka "unlink" in old unix).

	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.