NAME: writebat
PURPOSE: write the bathymetry ASCII file of OPA
CATEGORY: for OPA
CALLING SEQUENCE: writebat, bat, filename,
INPUTS:
bat: the bathymetry, a 2d array
filename: a string containing the filename,
KEYWORD PARAMETERS:
OUTPUTS:no
COMMON BLOCKS:no
SIDE EFFECTS:
RESTRICTIONS:
EXAMPLE: