condition mean min max 4 h after light 0.45374 0.270764 0.636716 8 h after light 0.6639145 0.296099 1.03173 12 h after light 0.523482 0.450026 0.596938 4 h after dark 0.9502835 0.877867 1.0227 8 h after dark 1.137368 0.946156 1.32858 12 h after dark 0.8190625 0.784261 0.853864