Unclassed choropleth maps use a technique of assigning shadings proportional to the data values without classifying the data it's displaying. This map shows the flsh density of the US between 1995 and 2006, using different shades to show the values. You can see that the highest density occurs mainly in Florida and the further you get from it the lower it is.
http://www.weather.gov/os/lightning/images/Vaisala_96-05_Flash_Map.gif
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