condition mean min max 3 h after light 9.272229166666667 3.31466 15.4446 7 h after light 8.2150675 3.41723 18.4907 11 h after light 9.078172499999999 4.80296 17.4229 2 h after dark 9.880316666666667 4.3248 14.6304 6 h after dark 8.233975833333334 4.08785 14.4643 10 h after dark 8.069569166666666 4.62953 13.2808