condition mean min max 4 h after light 5.74466 5.66061 5.82871 8 h after light 4.518465 4.3019 4.73503 12 h after light 8.319755 7.30726 9.33225 4 h after dark 9.223505 9.18337 9.26364 8 h after dark 11.2468 10.8152 11.6784 12 h after dark 9.74282 9.12104 10.3646