This image is a Choropleth map, which is the most common type of statistical map. Choropleth maps portray areal data. Areal divisions are often boundaries like census tracts, counties, states. This map shows the amount of spending (in millions) by overseas residents in 2003, and it classifies the data into five intervals. Typically four to seven intervals are used, and this map is well within the standards of Choropleth maps.
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