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Scatter plot for PCA of geochemical data from 36 samples over three sampling dates (A) and from a 24-sample subset of data that includes MeHg data (B). The percentage of total variance explained by each axis is noted in the axis label. Individual parameters (r > 0.6) significantly associated with the variation are represented along each axis. Open symbols represent midchannel samples, and closed symbols represent near-bank samples.
