condition	mean	min	max
4 h after light	18.15265	17.1889	19.1164
8 h after light	12.21895	11.8523	12.5856
12 h after light	8.37349	8.07467	8.67231
4 h after dark	6.980595	6.92481	7.03638
8 h after dark	9.4282	9.23882	9.61758
12 h after dark	11.9284	11.5621	12.2947