  1.  NAME

  vgeo_sta - Plot statistics about reference level

  2.  SYNOPSIS

  vgeo_sta(year_base, file_name, x, title, institute, info )

  3.  DESCRIPTION

  This function is called by vgeo(1m) for plotting statistics about the
  chosen reference level, as calculated by vgeo(1).  if no depths are
  specified).

  It takes as input file a sta file as those generated by vgeo(1). This
  file has the following columns:

  1.

  2. time (decimal day)

  3. longitude

  4. latitude

  5. reference depth

  6. reference velocity

  7. error on reference velocity

  8. number of points used to calculate reference velocity

  4.  PARAMETERS

     year_base
        Year base used in vgeo(1).

     file_name
        Root name of data file. The function will automatically add the
        suffix .sta to it.

     x  Index to x-variable. This is a number corresponding to the x
        column in the data files. Possible values are:

        1. time

        2. longitude

        3. latitude

        If negative,the axis direction will be reversed.

     title
        Title of plot.

     institute
        Institute stamp.

     info
        String with additionnal information on plot.

  5.  OUTPUT

  The generated plot is saved in file file_name_sta.ps.

  6.  AUTHORS

  Pierre Jaccard, Geophysical Institute, University of Bergen, 1999

