SURAMP - Linearly taper the start and/or end of traces to zero.

 suramp <stdin >stdout [optional parameters]                     

 Required parameters:                                      
      if dt is not set in header, then dt is mandatory           

 Optional parameters                                       
      tmin=tr.delrt/1000      end of starting ramp (sec)         
      tmax=(nt-1)*dt          beginning of ending ramp (sec)           
      dt = (from header)      sampling interval (sec)            

 The taper is a linear ramp from 0 to tmin and/or tmax to the end of the trace.  Default is a no-op!                  


 Credits:

      CWP: Jack, Ken

 Trace header fields accessed: ns, dt, delrt