condition mean min max 4 h after light 6.9 6.9 6.9 8 h after light 5.7 4.5 6.9 12 h after light 6.75 4.3 9.2 4 h after dark 14.200000000000001 2.8 25.6 8 h after dark 4.0 3.9 4.1 12 h after dark 10.95 10.1 11.8