Index value plots help to show discrepancies in data and how far off values are from a fixed point. This plot in particular shows the average annual steamflow since 1999 in North Carolina.
http://3.bp.blogspot.com/-vhksSXhmxPM/TbOfdfg1_aI/AAAAAAAAACs/HcYtpbWVuVs/s1600/Map+17.gif
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