condition mean min max 4 h after light 7.543159999999999 7.157769999999999 7.7903199999999995 8 h after light 7.4930200000000005 7.3019300000000005 7.843780000000001 12 h after light 5.984776666666667 5.71793 6.25133 4 h after dark 7.331636666666667 7.046530000000001 7.49547 8 h after dark 6.93979 6.674460000000001 7.4385 12 h after dark 8.382183333333334 7.687289999999999 9.16961