condition	mean	min	max
4 h after light	6.66197	6.57083	6.729360000000001
8 h after light	6.731616666666667	6.68324	6.79949
12 h after light	6.7121933333333335	6.64164	6.76525
4 h after dark	6.68966	6.5271	6.7739899999999995
8 h after dark	6.5521199999999995	6.42738	6.779839999999999
12 h after dark	6.4135800000000005	6.36319	6.45096