condition	mean	min	max
4 h after light	18.847050000000003	18.577	19.1171
8 h after light	8.904955	8.65754	9.15237
12 h after light	7.967264999999999	7.25796	8.67657
4 h after dark	14.65235	14.0006	15.3041
8 h after dark	19.77095	19.6153	19.9266
12 h after dark	22.31935	20.7739	23.8648