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...red colored cells. For any NAs, they should be colored white. I know how to create a map of the world using map() and add a grid to it using map.grid(), but I can't color code the cells the way I need. Is there a way to do this in R? Thanks again. dxc13 http://www.nabble.com/file/p23514804/time1test.txt time1test.txt -- View this message in context: http://www.nabble.com/plotting-a-grid-with-color-on-a-map-tp23514804p23514804.html Sent from the R help mailing list archive at Nabble.com.