condition mean min max 4 h after light 1.73122 1.66429 1.79815 8 h after light 0.9273485 0.908447 0.94625 12 h after light 1.3282725 0.917435 1.73911 4 h after dark 2.1120666666666668 1.8119 2.42358 8 h after dark 1.58271 1.30962 1.84111 12 h after dark 1.183395 0.917445 1.48169