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I'm making a graduated style map and I would like to add a class that would represent null values. I can add a class for zero (0) value ... meaning some of the areas reported zero report, but some areas don't have reports (i.e. null values). How can I add a class for null values?

Thank you in advance.

Herdie Hizon

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Please use the tags to specify which GIS software you are using. Also, the projection tag doesn't make much sense here. –  blah238 Mar 4 '13 at 8:46

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