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Box plots of specific conductivity (SC) distributions for EPA survey, State, U.S. Geological Survey (USGS) and Combined data sets. The State data set captures a narrower range of values possibly owing to the targeted sampling and narrower geographic range. The box represents the interquartile range with the median shown as a dark horizontal line. The vertical whiskers represent the upper and lower quartiles. Outliers are plotted as open circles. From U.S. EPA (2018).
