condition mean min max 4 h after light 7.5802625 7.514383 7.646142 8 h after light 7.676239 7.110699 8.241779 12 h after light 7.0788355 6.643288 7.514383 4 h after dark 8.056213 6.893397 9.219029 8 h after dark 7.42858 7.427017 7.430143 12 h after dark 8.234197 8.234197 8.234197