condition	mean	min	max
4 h after light	21.2	21.2	21.2
8 h after light	16.75	6.1	27.4
12 h after light	16.0	3.2	28.8
4 h after dark	17.45	4.0	30.9
8 h after dark	17.5	11.7	23.3
12 h after dark	5.75	3.9	7.6