condition	mean	min	max
4 h after light	6.21959	6.1458900000000005	6.29228
8 h after light	6.423126666666667	6.35378	6.47297
12 h after light	6.656553333333333	6.55134	6.8105899999999995
4 h after dark	6.397046666666666	6.38606	6.41766
8 h after dark	6.22729	6.14722	6.32865
12 h after dark	6.2353966666666665	6.18692	6.2847599999999995