SURESAMP - Resample in time

 suresamp <stdin >stdout  [optional parameters]      

 Required parameters:                                
      none                                     

 Optional Parameters:                                
      nt=tr.ns        number of time samples on output     
      dt=tr.dt/10^6         time sampling interval on output     
      tmin=tr.delrt/10^3  first time sample on output      

 Example 1: (assume original data had dt=.004 nt=256)      
      sufilter <data f=40,50 amps=1.,0. |                  
      suresamp nt=128 dt=.008 | ...                 
 Note the typical anti-alias filtering before sub-sampling.
 Example 2: (assume original data had dt=.004 nt=256)      
      suresamp <data nt=512 dt=.002 | ...           

 Credits:
      CWP: Dave (resamp algorithm), Jack (SU adaptation)

 Trace header fields accessed:  ns, dt, delrt
 Trace header fields modified:  ns, dt, delrt(only, when set tmin)