condition mean min max 4 h after light 4.496865 4.24448 4.74925 8 h after light 4.938175 4.68273 5.19362 12 h after light 5.171855 4.26718 6.07653 4 h after dark 7.314065 7.05189 7.57624 8 h after dark 6.099355 5.89703 6.30168 12 h after dark 5.777535 5.77496 5.78011