condition mean min max 4 h after light 6.26764 5.08116 7.45412 8 h after light 6.80073 6.77803 6.82343 12 h after light 8.42671 7.83113 9.02229 4 h after dark 9.9189 8.88727 11.3474 8 h after dark 9.868666666666666 9.11024 10.7098 12 h after dark 6.728983333333333 6.68276 6.78874