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Published on Feb 11, 2016
Visualization of the progress of reionization in a 1 Gpc/h volume. Ionized regions are blue and translucent, ionization fronts are red and white, and neutral regions are dark and opaque. A random sampling of 5 per cent (about 40,000) of all the halos at z = 0 are shown in yellow. Reionization is still quite inhomogeneous on these large scales, with large regions ionizing long before others.