condition mean min max 4 h after light 5.8 5.8 5.8 8 h after light 2.55 1.2 3.9 12 h after light 0.75 0.6 0.9 4 h after dark 34.85 1.2 68.5 8 h after dark 45.45 30.7 60.2 12 h after dark 11.7 9.1 14.3