... CMB

3 movies are only available in electronic form at http://www.edpsciences.org. See additional movies illustrating the effect at http://www.mpa-garching.mpg.de/~jalberto

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...ández-Monteagudo^1,

Present address: Dept. of Physics & Astronomy, Univ. of Pennsylvania, 209 South 33rd Str., Philadelphia, PA 19104-6396, USA.

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... redshift

Note that in our notation, $n_{\rm H}=n_0 (1+z)^3$ is the total number density of hydrogen, so $n_{\rm H} = n_{{\rm HI}} + n_{\rm p}$.

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