condition	mean	min	max
4 h after light	6.60372	6.55467	6.632910000000001
8 h after light	6.608513333333333	6.447030000000001	6.738119999999999
12 h after light	6.432376666666666	6.21871	6.67658
4 h after dark	6.48838	6.36452	6.7266
8 h after dark	6.542896666666667	6.48647	6.585889999999999
12 h after dark	6.541113333333334	6.48444	6.634760000000001