condition mean min max 4 h after light 4.0542 3.49048 4.61792 8 h after light 3.46345 3.15625 3.77065 12 h after light 8.516925 8.3992 8.63465 4 h after dark 8.08296 4.59372 11.5722 8 h after dark 3.89703 2.49917 5.29489 12 h after dark 6.531655 5.95749 7.10582