condition	mean	min	max
4 h after light	8.040370000000001	7.9391300000000005	8.10368
8 h after light	7.757603333333334	7.5891	7.9927
12 h after light	7.85947	7.74972	7.97328
4 h after dark	7.94545	7.688110000000001	8.09112
8 h after dark	7.926336666666667	7.73716	8.20275
12 h after dark	7.919843333333334	7.87938	7.96404