Unclassified choropleth maps are not put into classes. In other words there are as many intervals as there are areal units. The map above is fertility rates in European countries. Each country has a different fertility rate so they must each have a different shade, which is what I meant by number of intervals equal number of areal units. In this map the maximum fertility rate is 2.27(darkest shade of orange) and the minimum is 1.13(lightest shade of orange.)
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