NAME

     zeco  - module to derive 1st,  2nd  and  3rd  zero  crossing
     times from autocorrelation data.

SYNOPSIS

     zeco [ -Nntap ] [ -Ootap ] [ -sist ] [ -eiend ] [ -nsnstr  ]
     [ -nenetr ] [ -rsnrst ] [ -renred ] [ -V ] [ -? ]

DESCRIPTION

     zeco searches input data for the first three zero crossings.
     An  histogram  is kept for each and output in xgraph compat-
     able format.  The easiest way of running this routine is  to
     pipe  the  output  directly  into xgraph .  The time in mil-
     liseconds corresponding to the peak  of  each  histogram  is
     tabulated at the side of the xgraph display.

     zeco gets both its data and its parameters from command line
     arguments.  These  arguments  specify the input, output, the
     design window, the start and end traces, and  verbose  prin-
     tout, if desired.

  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.

     -s ist
          Enter the start time of the design window.  The default
          is  the  beginning  of  the  trace.  The filter will be
          applied to the whole trace, regardless of the -s and -e
          entries.

     -e iend
          Enter the end time of the design window.   The  default
          is the end of the trace.

     -ns nstr
          Enter the start trace number.  The default is the first
          trace of the record.

     -ne netr
          Enter the end trace number. The  default  is  the  last
          trace of the record.

     -rs nrst
          Enter start record number.  Default value is the  first
          record.

     -re nred
          Enter end record number.  Default value is last record.

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

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

BUGS

     Unknown.

SEE ALSO

     auto pred avepred taupred

AUTHOR

     P.G.A. Garossino, requested by S. Rothe (AFE)

COPYRIGHT

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