st: graphing data using map of US

["Boylan, Richard" <rboylan@cba.ua.edu>]

Does anyone know of a program that allows to graph data using the map
of the US?  I.e., a map of the us is drawn, and states that have higher values will have different shades than
states that have lower values for a variable.
 
Thanks.
 
Rihcard

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