condition mean min max 4 h after light 3.46739 2.8412 4.09358 8 h after light 1.966255 1.95629 1.97622 12 h after light 2.344995 2.17146 2.51853 4 h after dark 6.73052 6.17835 7.28269 8 h after dark 6.03791 5.57648 6.49934 12 h after dark 6.5022850000000005 6.41593 6.58864