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. 2020 Sep 16;151:105661. doi: 10.1016/j.jaerosci.2020.105661

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Fig. 2 — The variation of particle concentration (number/L) across different participants for (A) particles larger than 5 μm and (B) smaller than 5 μm. The dashed lines in the figures correspond to the average particle concentration. (C) The variation of the fraction of faceted particles across different participants with its average value marked by the dashed line in figure. (D) The variation of the fraction of faceted particles with respect to the normalized peak exhaled gas flow rate ( ${\hat{Q}}_{E, max}$ ) of each participant. The dashed line and the equation in the figure are the least square linear fit of the data.