PROCESS CAT
                       ------- ---

Document date: 29 September 1992

Process CAT concatenates consecutive traces or shots.  The concatenation
is done without regard for the deep water delay.  i.e. The last sample
of the trace being appended is always adjacent to the first sample the
next trace.

The output SEGY header is the header of the first trace of
the series being concatenated.
Shot/rp concatenation means that like traces are concatenated.  
e.g. type shot n 2
      shot 2 trace 1 is appended to shot 1 trace 1 and
      shot 2 trace 2 is appended to shot 1 trace 2.

Trace concatenation means N consecutive traces are appended.  e.g. for n 2
e.g. type trace n 2
      shot 1 trace 2 is appended to shot 1 trace 1.
      shot 1 trace 4 is appended to shot 1 trace 3.

There is no spatial interpolation.

Each parameter list must be terminated with the word END.

A null set of parameters must be given if all the parameters are
presets.  e.g.    cat end end

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

TYPE   - The type of concatenation.
       = TRACE,
       = SHOT,
         Preset = shot         e.g. type trace

N      - The number of consecutive traces or shots to concatenate
         in each output record.  A value of 0 or 1 means that no
         concatenation should take place.
         Preset = 2            e.g. n 3

FNO    - The first shot/rp number the parameter list applies to.
         Preset = the first shot/rp received.    e.g.   fno 101

LNO    - The last shot/rp number the parameter list applies to.
         Preset = the last shot/rp received.    e.g.   lno 101

END    - Terminates the parameter list.


Copyright (C) 1992 The Regents of the University of California
ALL RIGHTS RESERVED.