condition mean min max 4 h after light 3.76775 3.57789 3.95761 8 h after light 4.08028 3.72304 4.43752 12 h after light 4.39837 4.18446 4.61228 4 h after dark 6.028885 5.45928 6.59849 8 h after dark 5.61688 5.51614 5.71762 12 h after dark 5.62598 5.52917 5.72279