condition mean min max 4 h after light 67.2 67.2 67.2 8 h after light 64.1 57.2 71.0 12 h after light 81.6 69.7 93.5 4 h after dark 101.85 98.9 104.8 8 h after dark 88.4 83.6 93.2 12 h after dark 82.15 71.7 92.6