Table 1: Freeze-out values of free electrons, ${\rm H}_2$ and ${\rm HD}$ at z=100.
Cosmology/Ref. [${\rm e}$ /${\rm H}$ ] $[{\rm H}_2/{\rm H}]$ $[{\rm {\rm HD}/{\rm H}}]$
WMAP 3 + SDSS $2.63\times10^{-4}$ $4.23\times10^{-7}$ $2.39\times10^{-10}$
(PS07) $\sim$10-4 $1.5\times10^{-7}$ $\sim$ $2\times10^{-10}$
(HP06) - $\sim$ $2\times10^{-8}$ -
Analytic approx. $2.0\times10^{-4}$ $2.9\times10^{-7}$ $1.6\times10^{-10}$
(GP98) $\sim$ $2.4\times10^{-4}$ $\sim$ $1\times10^{-7}$ $8\times10^{-11}$


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