condition mean min max 4 h after light 9.984534 9.120501 10.848567 8 h after light 9.5526105 9.497579 9.607642 12 h after light 9.0712005 8.534759 9.607642 4 h after dark 8.6114245 7.615207 9.607642 8 h after dark 10.5906585 9.298958 11.882359 12 h after dark 8.948263 8.948263 8.948263