condition	mean	min	max
4 h after light	7.543305	6.88853	8.19808
8 h after light	7.02389	6.95458	7.0932
12 h after light	7.390445	7.04394	7.73695
4 h after dark	7.740015	7.70511	7.77492
8 h after dark	8.729495	8.34892	9.11007
12 h after dark	8.584	8.18015	8.98785