condition mean min max 4 h after light 5.83351 5.2044 6.46262 8 h after light 8.81005 8.57492 9.04518 12 h after light 8.01078 7.785 8.23656 4 h after dark 10.033945 9.86119 10.2067 8 h after dark 9.83715 8.9713 10.703 12 h after dark 9.07968 8.00826 10.1511