condition mean min max 4 h after light 103.9 103.9 103.9 8 h after light 115.2 95.4 135.0 12 h after light 128.1 109.2 147.0 4 h after dark 145.7 115.3 176.1 8 h after dark 136.25 101.6 170.9 12 h after dark 120.95 113.1 128.8