condition	mean	min	max
4 h after light	4.8	4.8	4.8
8 h after light	7.45	6.5	8.4
12 h after light	8.4	6.2	10.6
4 h after dark	8.65	8.3	9.0
8 h after dark	11.2	6.9	15.5
12 h after dark	5.6	5.1	6.1