how to overlay three plots in one figure ?

Hi ,ncl users Now I want to plot 3 fields in one figure. one is shaded plot
and the other two are in contour.
and my codes are shown below.How could I modify my script? thank you .

  plot = gsn_csm_contour(hgt_wks,HGT,res)
   plot2 = gsn_csm_contour(hgt_wks,RH,res1)
   plot3 = gsn_csm_contour(hgt_wks,TMP,res2)
   overlay(plot,plot2,plot3)
   draw(plot)
   frame(hgt_wks)
   end

-- 
TANG Jie

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Received on Mon Dec 12 00:46:26 2011