condition	mean	min	max
4 h after light	19.414	18.4675	20.3605
8 h after light	8.883915	7.79293	9.9749
12 h after light	11.80915	10.1521	13.4662
4 h after dark	15.1874	14.4027	15.9721
8 h after dark	18.1415	16.0082	20.2748
12 h after dark	18.20035	15.76	20.6407