condition	mean	min	max
4 h after light	7.35395	7.1879800000000005	7.49718
8 h after light	7.473916666666667	7.32345	7.585560000000001
12 h after light	7.5418	7.396539999999999	7.74915
4 h after dark	8.73786	8.56431	8.91479
8 h after dark	8.397926666666667	8.2693	8.472000000000001
12 h after dark	8.509126666666667	8.28922	8.68914