wrf levels missing in ncl crosssection plot

Dear NCL-Team,

I ran WRF with 60 eta levels and did some plots with this ncl-crosssection-script:

http://www.mmm.ucar.edu/wrf/OnLineTutorial/Graphics/NCL/Examples/CROSS_SECTION/wrf_CrossSection4.htm

In the plot the data begins at a height of 300 meters, but I know that there is (for
some parts of the domain) data down to 40 meters, because I can see it using this
script, displaying height-levels:

http://www.mmm.ucar.edu/wrf/OnLineTutorial/Graphics/NCL/Examples/LEVELS_INTERP/wrf_Height.htm

Is there a restriction within the first script, that it can only display levels of that
have no missing values? If so, how can I circumvent it?
But even if there is this restriction, then the displayed data should go down to ca. 180
meters representing the highest hill in the domain.

Thanks for any hint!
Thomas

-- 
KlimaCampus University Hamburg
Institute for Geography
Bundesstr. 55, D-20146 Hamburg
Room 837, Tel. 0049 40 42838 4956
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