condition mean min max 4 h after light 6.9 6.9 6.9 8 h after light 6.95 3.4 10.5 12 h after light 5.3 4.0 6.6 4 h after dark 5.300000000000001 3.2 7.4 8 h after dark 5.8500000000000005 1.8 9.9 12 h after dark 7.8 3.0 12.6