condition	mean	min	max
4 h after light	6.1	6.1	6.1
8 h after light	13.95	6.9	21.0
12 h after light	23.6	8.0	39.2
4 h after dark	19.2	6.1	32.3
8 h after dark	21.2	12.7	29.7
12 h after dark	15.45	5.0	25.9