condition mean min max 0 h after light 0.0 0.0 0.0 4 h after light 0.0 0.0 0.0 8 h after light 0.0178052 0.0 0.0356104 4 h after dark 0.0177451 0.0 0.0354902 8 h after dark 0.0 0.0 0.0 12 h after dark 0.0 0.0 0.0