condition	mean	min	max
4 h after light	18.38803	17.913567	18.862493
8 h after light	16.051275	15.250902	16.851648
12 h after light	15.742743	15.488603	15.996883
4 h after dark	13.814536	13.546956	14.082116
8 h after dark	15.060479	14.124075	15.996883
12 h after dark	16.60458	16.60458	16.60458