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Colour fill contour plots

I am wanting to do two colour fills on a single plot, but can't seem to
get a "transparent" colour.

I can colour in between just the values I want with something like
but then this blacks (background colour) in all values of a over 80.

I have tried
but this fills all values over 70 with my required colour.

What I want to do is to fill between 70 and 80 with a particular colour
but leave the rest of the plot

Any ideas?


Morwenna Griffiths
Department of Mathematics and Statistics,
P.O. Box 28M,
Monash University,
Vic. 3800,

Email: morwenna.griffiths@sci.monash.edu.au
Web page: http://www.maths.monash.edu.au/~morwenna

Phone:   (03) 9905 4411

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