condition	mean	min	max
4 h after light	3.6	3.6	3.6
8 h after light	1.85	1.8	1.9
12 h after light	20.45	14.1	26.8
4 h after dark	20.45	2.6	38.3
8 h after dark	19.1	1.1	37.1
12 h after dark	9.05	4.9	13.2