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. Author manuscript; available in PMC: 2021 May 1.
Published in final edited form as: Environ Sci Pollut Res Int. 2020 Feb 14;27(13):14883–14902. doi: 10.1007/s11356-019-06746-y

Fig. 5c.

Fig. 5c

Box and whisker plots of minor element concentrations (ppm) categorized by traffic density. 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). The graph truncates at 3,500 ppm for clarity, omitting a Pb outlier of 6,147 ppm and Sn outlier of 9,339 ppm