An index value plot is a type of visualization map in which an index value, instead of and absolute value, is plotted on a line graph. This type of plot gives a comparison, or normal, in order to base the values off of. This particular example show the average streamflow index in North Carolina and ranged from mid February to the each of March. The average stream flow index is plotted based upon particular days of the week and the number value of comparison is 4.
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