  1.  NAME

  hdg_diff - Compare mean and end ping heading

  2.  USAGE

  hdg_diff

  3.  DESCRIPTION

  This is an interface to function hdgdiff(3m).

  4.  PARAMETERS

  The following parameters must be edited:

     year_base
        Base year used for the decimal times in input file.

     asc_file
        Input data file.

     plot_title
        Title for the plot.

     note
        Additionnal string to print on the plot.

  5.  AUTHORS

  Pierre Jaccard, Geophysical Institute, University of Bergen, 1999

