shade + stipple plot

Hi all,

I'm trying to plot a correlation field (shade) with its significance (stipple), but my script doesn't work.
Specifically, I'm trying to use the example http://www.ncl.ucar.edu/Applications/Scripts/conOncon_4.ncl applying the "PLOT 2" part of this script, without success.

Coud you help me please?
Thank a lot
Andrea

P.S.: In attachment my script file

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