Blank spaces in shaded plots

[john mathew]

hello all,
when i run a script for correlation i get the shaded
contours with blank squares and
a warning in terminal like

Warning from SQRT:  Data has 88 values < zero
                    These were set to the undefined
value
Hardcopy output file is closed
ga->

As far i checked, the equation is right and had been
used for other parameters. but
for surface pressure it is showing the problem. i
attach the post script file of the
plot for better understanding. please give a tip as to
what could be wrong in this.
thank you.



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