condition	mean	min	max
4 h after light	3.1356450000000002	2.69965	3.57164
8 h after light	15.59075	14.5817	16.5998
12 h after light	18.9532	16.5358	21.3706
4 h after dark	12.90929	9.47448	16.3441
8 h after dark	8.54271	8.50493	8.58049
12 h after dark	2.566455	1.29315	3.83976