condition mean min max 4 h after light 6.332585 5.7543 6.91087 8 h after light 4.50464 4.46057 4.54871 12 h after light 4.94819 4.58751 5.30887 4 h after dark 5.93701 5.75342 6.22803 8 h after dark 6.31393 6.02301 6.82587 12 h after dark 6.145160000000001 5.65732 6.60444