condition mean min max 4 h after light 1.2 1.2 1.2 8 h after light 2.8 2.6 3.0 12 h after light 11.95 4.2 19.7 4 h after dark 4.4 1.9 6.9 8 h after dark 3.4000000000000004 2.4 4.4 12 h after dark 3.2 2.4 4.0