condition mean min max 4 h after light 1.3135 1.23822 1.38878 8 h after light 1.17382 1.092 1.25564 12 h after light 2.483745 2.21908 2.74841 4 h after dark 4.835825 4.39715 5.2745 8 h after dark 2.952675 2.91362 2.99173 12 h after dark 2.423875 2.21575 2.632