condition	mean	min	max
4 h after light	18.4448825	17.979238	18.910527
8 h after light	17.936927500000003	16.067568	19.806287
12 h after light	15.613129	15.033051	16.193207
4 h after dark	17.700773	17.046054	18.355492
8 h after dark	19.645384	18.750119	20.540649
12 h after dark	16.241785	16.241785	16.241785