condition	mean	min	max
4 h after light	1.5	1.5	1.5
8 h after light	7.15	5.3	9.0
12 h after light	10.0	4.3	15.7
4 h after dark	10.85	4.2	17.5
8 h after dark	20.0	11.9	28.1
12 h after dark	20.25	19.1	21.4