condition	mean	min	max
4 h after light	3.6743750000000004	2.32586	5.02289
8 h after light	2.986755	1.09006	4.88345
12 h after light	15.7554	14.9435	16.5673
4 h after dark	18.50975	16.7466	20.2729
8 h after dark	12.43545	10.3576	14.5133
12 h after dark	5.790015	5.29318	6.28685