condition	mean	min	max
4 h after light	6.584033333333334	6.34219	6.7234300000000005
8 h after light	6.62604	6.35537	6.79599
12 h after light	6.693593333333333	6.57125	6.8839999999999995
4 h after dark	6.54857	6.45149	6.60035
8 h after dark	6.509323333333334	6.32229	6.646730000000001
12 h after dark	6.565776666666667	6.3856	6.746010000000001