condition	mean	min	max
4 h after light	6.8	6.8	6.8
8 h after light	5.3	2.0	8.6
12 h after light	20.4	19.6	21.2
4 h after dark	3.2	2.1	4.3
8 h after dark	4.35	2.6	6.1
12 h after dark	3.0	0.8	5.2