condition	mean	min	max
4 h after light	6.4	6.4	6.4
8 h after light	17.2	15.1	19.3
12 h after light	8.35	8.2	8.5
4 h after dark	3.6	3.5	3.7
8 h after dark	18.85	10.0	27.7
12 h after dark	8.05	7.5	8.6