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. Author manuscript; available in PMC: 2020 Jul 1.
Published in final edited form as: Environ Res. 2019 Apr 22;174:125–134. doi: 10.1016/j.envres.2019.04.003

Figure 2.

Figure 2.

Boxplots of metal concentrations in aerosols by device type. The horizontal lines within boxes indicate medians; boxes, interquartile ranges; whiskers, values within 1.5 times the interquartile range from boxes; solid circles outside the box, outlier data values. For open-system devices (OD1, OD2), only samples collected at the intermediate power setting were analyzed.