condition	mean	min	max
4 h after light	10.56888889	8.36	14.22666667
8 h after light	10.227222221	8.085	13.87333333
12 h after light	15.29888889	9.09	20.57666667
1.5 h after dark	18.115555556666667	10.95666667	27.66333333
5.5 h after dark	16.07888889	9.31	28.29
9.5 h after dark	13.21222222	7.48	19.49333333