condition	mean	min	max
4 h after light	20.6	20.6	20.6
8 h after light	5.0	4.7	5.3
12 h after light	7.4	7.2	7.6
4 h after dark	9.3	9.0	9.6
8 h after dark	4.45	2.7	6.2
12 h after dark	4.3	4.1	4.5