http://www.cdc.gov/ncidod/eid/vol9no7/02-0653-G2.htm
Classed choropleth maps use color to represent a certain number of data groups and their values. These classed choropleth show the percent of men in the Royal Thai Army that had HIV in between 1991 and 2000. Darker blue and green shades represent higher percentages while lighter green and yellow show lower with white showing no HIV. According to these maps the presence of HIV in the Thai army has greatly decreased over these years.
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