contour over particular values of shading

[John Guhin]

Hi,
     I have a variable shaded (values form 1 to 10), and I want to plot a
contour of another variable on it. But I want to plot contours only over the
region where shaded values are more than 5. I tried with the following, but
did not work. It is plotting contours over all region. Any help will be
great....

'open a1.ctl'
'open a2.ctl'
'set lat -20 20'
'set lon 0 360'
'run B-R.gs'
'set clevs 1 2 3 4 5 6 7 8 9 10'
'set ccols 16 17 18 19 20 50 21 22 23 24 25'
'set gxout shaded'
'd var1'
if(var1>5)
'set ccolor 0'
'set gxout contour'
'set clevs 0.5 1.0 1.5 2.0'
'set ylpos 0 r'
'd var2.2'
endif
'run cbarn 0.7 0 4.0 5.5'


--
John Guhin
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