shading topography in slice

Hi,

How can I shade the topography in the second example given at:

http://www.ncl.ucar.edu/Applications/Scripts/2dvertcoords_1.ncl

Setting the color for missing values using

res@cnMissingValFillPattern= "SolidFill"
res@cnMissingValFillColor = "gray"

did not work out, since there are of course no actual missing values,
but the linearization creates the underlying white topography. It would
also be nice to know how I can only indicate the boundary (the surface)
between missing values and data.
Thanks for any help!

Kind regards,
Wolfgang

-- 
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Wolfgang Langhans
Institute for Atmospheric and Climate Science
ETH Zürich
Universitätstrasse 16
CH-8092 Zürich, Switzerland
e-mail: wolfgang.langhans@env.ethz.ch
phone : +41 44 632 78 18
fax   : +41 44 632 13 11
room  : CHN L16.3
web   : http://www.iac.ethz.ch/people/wolangha
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