condition mean min max 4 h after light 8.760001500000001 8.57174 8.948263 8 h after light 9.5216495 8.948263 10.095036 12 h after light 8.690066 8.462762 8.91737 4 h after dark 9.411883 8.64393 10.179836 8 h after dark 8.7772635 8.605562 8.948965 12 h after dark 8.693017 8.693017 8.693017