condition mean min max 0 h after light 1.798105 1.52944 2.06677 4 h after light 1.87707 1.82549 1.92865 8 h after light 3.359465 2.66741 4.05152 4 h after dark 5.37233 4.23001 6.51465 8 h after dark 6.8523 6.76693 6.93767 12 h after dark 2.438555 2.2671 2.61001