condition mean min max 4 h after light 3.07789 3.0734 3.08238 8 h after light 6.016475 5.5424 6.49055 12 h after light 9.41481 9.28696 9.54266 4 h after dark 9.42172 8.58254 10.2609 8 h after dark 7.65058 7.60962 7.69154 12 h after dark 5.19834 4.93539 5.46129