I am sorry if I have spammed NCL–Talk. My email server keeps telling me that my email was 'bounced'.
The images are not true overlays. They are two separate pdf images; I just copy pasting them into my presentation.
The ones completed in NCL5.1.2 automatically made all _FillValues transparent, where both NCL6.0.0 and 6.1.2 do not. I do not have access to NCL5.1.2 anymore, as the IT services have removed NCL5.1.2.
My script is modularized to accept a variety of input files, which is too much information for NCL-Talk. What I can do is send a version that has just the plotting routines. I have added cnMissingValFillPattern= "Transparent", however, the results were the same with the background/_FillValue being white, not transparent.
-Jonathan
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