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Box and whisker plots of major element (Na, P, K, Ti) concentrations (wt%) categorized by land use. The x represents mean value, whereas the horizontal line is median value. All points outside of the box (IQR) and whiskers (min. and max. values – excluding outliers) are outliers (1.5x below the 1st quartile or 1.5x above the 3rd quartile)
