http://waterwatch.usgs.gov/regplots/real/real_tn_2.gifAn Index Value Plot represents information either being above average, average, or below a average rate. An Index Value Plot is a type of a visualization map. This Index Value Map represents Tennessee's stream flow during the years 2000-2009. It shows whether or not the stream flow was wet (above average), normal, or dry (below average).
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