condition	mean	min	max
4 h after light	6.58933	6.49235	6.7635
8 h after light	6.390506666666667	6.346030000000001	6.41277
12 h after light	6.513086666666666	6.41439	6.591589999999999
4 h after dark	6.634869999999999	6.46877	6.80265
8 h after dark	6.481483333333333	6.29617	6.7244600000000005
12 h after dark	6.5164333333333335	6.3189	6.662730000000001