NAME

     downsum  - module  to  do  downsum  Frequency  Determination
     Panel

SYNOPSIS

     downsum [ -Nntap ] [ -rsnrst ] [ -renred ] [  -f1freq1  ]  [
     -fmaxmaxfreq ]

DESCRIPTION

     downsum is a  c-shell script which utilizes several USP rou-
     tines to construct a downsum panel of the input dataset.  It
     is recommended that a single record at a time be  processed.
     The output consists of the input record followed by a set of
     bandpass  records  corresponding  to  the  number  of  input
     filters  used,  followed by a set of summation records.  The
     upper frequency of each bandpass and downsum record is  con-
     tained  in  the  RecNum trace header entry for plotting with
     TPLTR. The first bandpass has the following filter points:

      f1 =  -f1
      f2 =  -f1  + 5
      f3 =  -f1  + 10
      f4 =  -f1  + 15

     The number of output bandpass filters is a function  of  the
     -fmax  and  the  above  bandpass will have each entry incre-
     mented by 10 hertz until the f4 entry becomes  greater  than
     -fmax.

     downsum gets both its data and its parameters  from  command
     line  arguments.   These  arguments specify the input, start
     and end records, initial f1 frequency and  maximum  f4  fre-
     quency.

  Command line arguments
     -N ntap [no default]
          Enter the input data set name or file immediately after
          typing  -N  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'.

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

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

     -f1 freq1
          Enter the initial f1 frequency.  Default value is zero.

     -fmax maxfreq
          Enter the limiting f4 frequency for the panel.  Default
          value is 95 hertz.

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

BUGS

     unknown

SEE ALSO

     downsum(1)

AUTHOR

     Paul Garossino

COPYRIGHT

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