Good day all. Attached please find a distribution of latitude and longitude
lightning activity on world map. This plot was done using raster package.

My headache now is how to use a symbol, say star, to mark or identify a
country, e.g. South Africa or USA, on the plot.

Thank you.


URL:
http://docs.google.com/Doc?docid=0AfJ5_yv8GrERZGY3NmhuMnNfMWZtcGhjc2d3&hl=en

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