PROCESS TP2TX
                       ------- -----

Parameters, alphabetically:
IHPATH   NX       PCTNO    SET      SEX      SET      SETAU

Document date: 

Process TP2TX transform data in the tau-p space domain to the 
time-distance space using the "HOP" method for slant stack (see
process TX2TP).  Process TX2TP must have been run prior to TP2TX,
preferably in the same PROCS list since many TP2TX parameters are
set by process TX2TP and are lost in they are not in the same list.

                                               
                                               
PARAMETER DICTIONARY
--------- ----------

SETAU  - The start and end taus to input.
         Preset = The start and end taus of the TAU-P data if TX2TP is
                  also a process.
         Preset = calculated from the data.

SET    - The start and end times of the output t-x data. 
         Preset = The start and end times of the TX data if TX2TP is
                  also a process.

SEX    - Start and end ranges (x) to calculate and output.
         Preset = The start and end ranges of the TX data if TX2TP is
                  also a process.

NX     - The number of ranges to calculate.  NX is the increment
         between the start and end ranges (SEX).
         Preset = the number of input time traces if TX2TP is
                  also a process.

IHPATH - Input header pathname.  TP2TX will ouput the data with the 
         SEGY trace headers from disk file IPATH rather than from the
         input tau-p traces.
         Preset =  none

PCNTO  - Percent taper applied to models before the inverse FFT.
         Preset = 0.

Copyright (C) by The Regents of The University of California, 1988
ALL RIGHTS RESERVED.