condition mean min max 4 h after light 10.385541 9.900072 10.87101 8 h after light 9.963568 9.476677 10.450459 12 h after light 9.267215 8.91737 9.61706 4 h after dark 9.754629 9.609186 9.900072 8 h after dark 9.174186 8.371396 9.976976 12 h after dark 13.661786 13.661786 13.661786