condition	mean	min	max
4 h after light	6.4	6.4	6.4
8 h after light	5.45	4.7	6.2
12 h after light	6.75	6.7	6.8
4 h after dark	12.95	12.2	13.7
8 h after dark	10.3	9.7	10.9
12 h after dark	6.0	5.2	6.8