condition mean min max 4 h after light 2.7 2.7 2.7 8 h after light 11.65 3.0 20.3 12 h after light 2.7 2.6 2.8 4 h after dark 5.2 3.7 6.7 8 h after dark 14.5 3.6 25.4 12 h after dark 10.2 4.2 16.2