condition mean min max 4 h after light 9.139861 8.904027 9.375695 8 h after light 9.280534 9.048355 9.512713 12 h after light 8.7951685 7.847117 9.74322 4 h after dark 8.0220365 7.870751 8.173322 8 h after dark 8.7457385 7.303376 10.188101 12 h after dark 9.389476 9.389476 9.389476