condition	mean	min	max
4 h after light	6.60374	6.5147	6.739960000000001
8 h after light	6.56517	6.55422	6.5739399999999995
12 h after light	6.535893333333333	6.4743699999999995	6.633839999999999
4 h after dark	6.570926666666667	6.3724099999999995	6.737089999999999
8 h after dark	6.627173333333333	6.31471	6.982489999999999
12 h after dark	6.655613333333333	6.46906	6.803389999999999