condition mean min max 0 h after light 9.71719 8.38738 11.047 4 h after light 9.74388 8.94266 10.5451 8 h after light 12.00925 11.3635 12.655 4 h after dark 14.2484 13.3621 15.1347 8 h after dark 12.13115 11.6645 12.5978 12 h after dark 8.95804 8.94183 8.97425