condition mean min max 4 h after light 48.4 48.4 48.4 8 h after light 9.95 8.5 11.4 12 h after light 20.8 16.3 25.3 4 h after dark 11.05 10.1 12.0 8 h after dark 17.85 16.0 19.7 12 h after dark 11.8 8.7 14.9