condition mean min max 4 h after light 3.3 3.3 3.3 8 h after light 23.25 8.8 37.7 12 h after light 5.9 2.3 9.5 4 h after dark 6.35 2.7 10.0 8 h after dark 14.2 4.6 23.8 12 h after dark 7.45 5.1 9.8