condition mean min max 4 h after light 0.7 0.7 0.7 8 h after light 16.0 2.3 29.7 12 h after light 1.35 1.3 1.4 4 h after dark 1.5 1.4 1.6 8 h after dark 10.9 1.7 20.1 12 h after dark 11.450000000000001 1.6 21.3