condition	mean	min	max
4 h after light	6.2	6.2	6.2
8 h after light	4.15	2.3	6.0
12 h after light	15.15	5.8	24.5
4 h after dark	17.7	10.0	25.4
8 h after dark	5.85	4.1	7.6
12 h after dark	7.0	4.1	9.9