plots multiple files

Hi

I've recently written a script to display analysis data from multiple files.
The plots consist of two separate contour maps; both of which are an overlay
of two fields. The first two plots from the first file display correctly,
but in any subsequent file, the top plot fails to show the filled contour.
The colour bar is present but the figure remains black and white. I'm not
sure why this is happening, especially since it works for the first file in
the loop. I've attached the file and any help would be appreciated.

Thanks

Chris

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• application/octet-stream attachment: analysis.ncl