condition	mean	min	max
4 h after light	6.66256	6.634930000000001	6.7024
8 h after light	6.718683333333334	6.46698	6.99282
12 h after light	6.6825399999999995	6.58528	6.7804
4 h after dark	6.672346666666667	6.62582	6.72002
8 h after dark	6.711696666666667	6.5267599999999995	6.81878
12 h after dark	6.426623333333334	6.35372	6.54117