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 0.181987 0.0 0.363974 4 h after dark 0.3518635 0.35117 0.352557 8 h after dark 0.353636 0.352152 0.35512 12 h after dark 0.17854 0.0 0.35708