condition mean min max 4 h after light 1.8 1.8 1.8 8 h after light 9.649999999999999 9.2 10.1 12 h after light 7.55 6.4 8.7 4 h after dark 4.4 3.3 5.5 8 h after dark 5.65 3.6 7.7 12 h after dark 5.6 3.1 8.1