condition	mean	min	max
4 h after light	2.4	2.4	2.4
8 h after light	2.15	1.2	3.1
12 h after light	2.15	1.0	3.3
4 h after dark	2.3	1.2	3.4
8 h after dark	2.75	2.1	3.4
12 h after dark	1.9	1.5	2.3