condition	mean	min	max
4 h after light	7.7	7.7	7.7
8 h after light	18.85	15.5	22.2
12 h after light	16.75	9.0	24.5
4 h after dark	13.7	7.5	19.9
8 h after dark	8.7	7.1	10.3
12 h after dark	16.7	14.2	19.2