condition	mean	min	max
4 h after light	18.66255	17.2971	20.028
8 h after light	14.47745	13.6169	15.338
12 h after light	15.818349999999999	14.3499	17.2868
4 h after dark	19.372349999999997	18.6861	20.0586
8 h after dark	21.372	20.4241	22.3199
12 h after dark	21.953850000000003	21.9326	21.9751