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Top row shows R2 values (y-axis) across buffer distances (x-axis) for 2008 models (solid line type) and 2015 models (dashed line type) and two masking methods: no mask (dark color) and unpopulated pixels only (light color). Second and third rows show ‘IncNodePurity’ values (y-axis) for each predictor variable (x-axis) for unmasked (dark color) and unpopulated pixels only (light color) extracted from the best performing models.
