condition mean min max 4 h after light 1.13276 1.08855 1.17697 8 h after light 0.8690995 0.782386 0.955813 12 h after light 0.8209705 0.772597 0.869344 4 h after dark 1.6713 1.51366 1.7746 8 h after dark 1.2961 1.02224 1.59218 12 h after dark 2.16029 1.54448 2.57271