condition mean min max 4 h after light 2.1 2.1 2.1 8 h after light 4.75 3.8 5.7 12 h after light 6.55 3.9 9.2 4 h after dark 6.3 5.0 7.6 8 h after dark 3.8 3.6 4.0 12 h after dark 5.550000000000001 2.7 8.4