Plotting Antarctica

If I plot a map of Antarctica and specify mpDataBaseVersion = "Ncarg4_1"
then if I set mpDataSetName = "Earth..3", it will plot the edge of the
ice-shelves
  but if I set mpdataSetName = "Earth..4", it will plot both the edge of
the land below the ice-shelves and the edge of the ice-shelves.

I am just wondering if there is a combination that I have missed, that
would just plot the edge of the land?

Thanks
Rosemarie
PS I am using gsn_csm_contour_map_polar but I don't suppose that makes
any difference in this.

-- 
Dr Rosemarie Drummond
rmarie@atmosp.physics.utoronto.ca
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