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. 2020 Nov 9;760:143391. doi: 10.1016/j.scitotenv.2020.143391

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Fig. 3 — Black carbon concentration levels modulate the interaction between R₀ and inorganic ionic PM_2.5 composition. Johnson-Neyman analysis of the response of ${\bar{R}}_{0}$ , where the predictor variable is sulfate-nitrate-ammonium (SNA) mass fraction and the moderator variable is black carbon (BC) mass fraction. (a) Plot of predicted ${\bar{R}}_{0}$ as a function of SNA fraction and BC fraction. (b) Plot of slope of panel (a) for constant SNA fraction. Grey shaded area shows the 95% confidence interval.