condition mean min max 0 h after light 2.29326 2.1298 2.45672 4 h after light 5.89043 5.63223 6.14863 8 h after light 6.747755 6.20388 7.29163 4 h after dark 7.20761 6.49602 7.9192 8 h after dark 5.06968 5.06759 5.07177 12 h after dark 3.25129 1.88724 4.61534