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Tribal Assessment The Columbia Plateau Region Correlation curves Here we present the inter-site correlations for this region by chemical species (S, NO3, OC, EC, soil and CM).  Each graph shows the correlation between all of the individual sites and their correlation.  The black line shows the curve fit to an exponential.  In the upper right hand corner of the graph, we show the exponential curve fit of the correlation verses distance as well as the correlation coefficient.