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. 2020 Sep 11;750:142323. doi: 10.1016/j.scitotenv.2020.142323

Fig. 4.

Fig. 4

Spline of TM to individual parameters (a) emission, (b) temperature, (c) relative humidity. The grey background around the line are 95% confidence bounds for the response. The short lines on x axes show the distribution of data points. The number in the bracket of ordinate title is the estimated degree of freedom. The dots in the figure are the residuals.