condition	mean	min	max
4 h after light	1.5	1.5	1.5
8 h after light	2.2	1.9	2.5
12 h after light	4.7	2.1	7.3
4 h after dark	15.05	13.1	17.0
8 h after dark	9.6	1.8	17.4
12 h after dark	7.35	2.2	12.5