condition mean min max 4 h after light 9.5069385 8.948263 10.065614 8 h after light 9.293201 8.513833 10.072569 12 h after light 8.6849955 8.421728 8.948263 4 h after dark 9.024785 8.89421 9.15536 8 h after dark 9.47146 8.655757 10.287163 12 h after dark 8.885548 8.885548 8.885548