condition mean min max 4 h after light 91.2 91.2 91.2 8 h after light 73.1 71.0 75.2 12 h after light 121.9 108.2 135.6 4 h after dark 34.95 15.0 54.9 8 h after dark 33.1 12.3 53.9 12 h after dark 55.9 53.3 58.5