condition	mean	min	max
4 h after light	7.10369	6.969530000000001	7.20165
8 h after light	7.150250000000001	6.941260000000001	7.3769800000000005
12 h after light	6.918513333333333	6.6347	7.07821
4 h after dark	7.19325	6.96737	7.39929
8 h after dark	7.315926666666667	7.18584	7.51473
12 h after dark	7.53299	7.335780000000001	7.89727