condition mean min max 4 h after light 8.0 8.0 8.0 8 h after light 6.75 2.5 11.0 12 h after light 2.8 2.6 3.0 4 h after dark 8.05 7.1 9.0 8 h after dark 6.45 3.9 9.0 12 h after dark 9.399999999999999 8.7 10.1