shade contour

Hi,
I have plotted a shaded figure with the setting of
res@cnFillMode = "RasterFill"
plot = gsn_csm_contour_map_ce(wks,ts,res)
 
Then I want to overlay a figure with the t value larger than 0.9 using the fill pattern of 17 (dotted):
plot2 = gsn_csm_contour(wks,gsn_add_cyclic_point(t,res20)
plot2 = ShadeGtContour(plot2,0.9,17)
overlay(plot,plot2)
 
How can the dotted area on plot2 be drawn out also with "RasterFill" type, or how can the value larger than 0.9 be filled with only one dot in one grid box?
 
Thank you! And looking forward to your kind reply!
 
Nancy

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Received on Mon Jul 8 07:56:53 2013