condition	mean	min	max
4 h after light	15.8	15.8	15.8
8 h after light	12.95	8.5	17.4
12 h after light	19.55	12.9	26.2
4 h after dark	23.15	16.9	29.4
8 h after dark	11.25	1.7	20.8
12 h after dark	1.95	1.9	2.0