Index Value Plot- A line graph plotting index numbers instead of absolute numbers. Changes in a given variable over time relative to the initial year can easily be seen. This is accomplished by dividing values for subsequent years by the initial average and multiplying by 100. Here, average streamflow deviations from what is considered "normal" in the US from 2000 to 2010 are graphed, showing cyclic fluctuations from wet to dry conditions over the decade (http://waterwatch.usgs.gov/?m=real&w=plot).
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