condition mean min max 4 h after light 2.1 2.1 2.1 8 h after light 5.05 1.9 8.2 12 h after light 2.0 1.6 2.4 4 h after dark 3.25 2.9 3.6 8 h after dark 6.45 3.5 9.4 12 h after dark 20.299999999999997 3.3 37.3