condition	mean	min	max
4 h after light	21.02585	18.1421	23.9096
8 h after light	17.22645	16.6961	17.7568
12 h after light	16.1522	15.5294	16.775
4 h after dark	17.061666666666667	16.6456	17.71
8 h after dark	20.7869	20.2306	21.7553
12 h after dark	18.852266666666665	18.1908	20.0015