NAME

     detmute  - module to determine onset and offset of data  and
     place these times in header.

SYNOPSIS

     detmute  [  -Nntap  ]  [  -Ootap  ]   [   -hw1mnemonic1]   [
     -hw2mnemonic2] [ -nsnstr ] [ -nenetr ] [ -rsnrst ] [ -renred
     ] [ -V ] [ -? ]

DESCRIPTION

     detmute determines the  first  non-zero  sample  encountered
     from the top down and from the bottom up on the input trace.
     The last zero sample time prior to data  is  stored  in  the
     trace  header.   The  top time is stored in  -hw1  while the
     bottom time is stored in  -hw2 .   The  defaults  for  these
     are   SGRNum   and  VPick1.  If using the defaults the mutes
     may be restored using  mute -R  .   If  not,  mutes  may  be
     restored  using   detmute  -hw1[]  -hw2[] -R  where the non-
     default header values are re-entered.

INPUT

     detmute gets both its data and parameters from command  line
     arguments.   These arguments specify the input, output, flat
     file, start and end traces, start and end  record.   Verbose
     printout is available.

  Command line arguments
     -N ntap
          Enter the input data set name or file immediately after
          typing -N unless the input is from a pipe in which case
          the -N entry must be omitted.  This input  file  should
          include the complete path name if the file resides in a
          different directory.  Example -N/b/vsp/dummy tells  the
          program to look for file 'dummy' in directory '/b/vsp'.

     -O otap
          Enter the output data  set  name  or  file  immediately
          after  typing -O. This output file is not required when
          piping the output to another process. The  output  data
          set also requires the full path name (see above).

     -hw1 mnemonic1   [default: VPick1]
          Enter the trace header mnemonic in which to  store  the
          onset of data time.

     -hw2 mnemonic2   [default: VPick2]
          Enter the trace header mnemonic in which to  store  the
          end of data time.

     -ns nstr    [default: first trace]
          Enter start trace.

     -ne netr    [default: last trace]
          Enter end trace.

     -rs nrst    [default: first record]
          Enter start record.

     -re nred    [default: last record]
          Enter end record.

     -V   Enter the command line argument '-V' to get  additional
          printout.

     -? or -h
          Enter the command line argument '-?'  or   -h   to  get
          online  help.   The  program  terminates after the help
          screen is printed.

BUGS

     none reported

AUTHOR

     Paul G.A. Garossino APR:3932

COPYRIGHT

     copyright 2001, Amoco Production Company
               All Rights Reserved
          an affiliate of BP America Inc.