condition	mean	min	max
4 h after light	2.1	2.1	2.1
8 h after light	3.25	2.6	3.9
12 h after light	1.6	1.4	1.8
4 h after dark	1.35	0.9	1.8
8 h after dark	1.9	1.7	2.1
12 h after dark	1.1	1.0	1.2