condition	mean	min	max
4 h after light	5.9	5.9	5.9
8 h after light	18.85	6.4	31.3
12 h after light	15.9	3.8	28.0
4 h after dark	4.6	4.5	4.7
8 h after dark	18.15	16.8	19.5
12 h after dark	1.6	1.5	1.7