Hi,



Does anyone know how to create mapping of attribute A and attribute B so that the overlapping areas are not colour A or B but the mixture of the two (the semi-transparent effect). In case that does not sound clear, I am looking for this kind of effect



http://tinyurl.com/cko7c4b created by Divid McCandless (probably not using R?)



If anyone knows a function/package which could allows to do something like this, I would be very gretful for suggestions.



Cheers,

Juta

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