Opacity in contour plot

Dear All,
       I am using NCL verion 6.1.0-beta to make partially transparent
contour plots. For me, the resource "cnFillOpacityF" works only with
cnFillMode = "AreaFill". It doesn't have any effect on RasterFill or
CellFill.
This is problem for me because "AreaFill" is producing the following message.

fatal:ContourPlotDraw: ARSCAM/ARPRAM - ALGORITHM FAILURE
fatal:ContourPlotDraw: draw error
warning:WorkstationDeactivate: workstation not active or not opened

I can avoid this message by setting cnFillMode to RasterFill but then
I cannot use transparency through cnFillOpacityF.

Any suggestion to solve this problem
Thanks in advance.

Regards
Nadeem
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Received on Wed Oct 17 07:32:58 2012