condition	mean	min	max
4 h after light	6.81789	6.58367	6.95425
8 h after light	6.3437166666666664	6.0869800000000005	6.625039999999999
12 h after light	6.590963333333333	6.42108	6.70942
4 h after dark	6.43972	6.377000000000001	6.50906
8 h after dark	6.4819233333333335	6.33606	6.5739
12 h after dark	6.480826666666666	6.250369999999999	6.71484