condition	mean	min	max
4 h after light	6.78282	6.640610000000001	6.88029
8 h after light	6.6425	6.521669999999999	6.75703
12 h after light	6.67455	6.62395	6.7248600000000005
4 h after dark	6.59798	6.51323	6.68128
8 h after dark	6.732673333333333	6.56668	6.9724699999999995
12 h after dark	6.69285	6.44262	6.864380000000001