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. 2018 Sep 12;2(3):e020. doi: 10.1097/EE9.0000000000000020

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Figure 2. — Land use regression models for Fe (% mass), (A: Model R² = 0.68; Cross-validation R² = 0.53), Cu (% mass), (B: Model R² = 0.81; Cross-validation R² = 0.77), and their estimated impact on ROS (C: Model R² = 0.64; Cross-validation R² = 0.56) during summer in Toronto, Canada. Dots and shaded lines reflect point estimates and 95% confidence intervals.