http://www.ilstu.edu/~jrcarter/Geo204/Choro/map-AmFact-4round-green-80pct.jpg
In a Classed Choropleth Map it is important to determine the height and shading or color intensity of the bar for each map classed. By creating a classed frequency legend including and frequency histogram, frequency curve, and shading it is much easier to identify such as in this Census map.
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