condition	mean	min	max
4 h after light	19.00015	16.9629	21.0374
8 h after light	12.37575	10.7567	13.9948
12 h after light	7.993655	6.51425	9.47306
4 h after dark	6.673753333333333	6.467	6.82253
8 h after dark	7.3191	7.068	7.56829
12 h after dark	13.890133333333333	12.818	15.566