Table 2: Freeze-out values of free electrons, ${\rm H}_2$ and ${\rm HD}$ at z=10.
Cosmology/Ref. [${\rm e}$ /${\rm H}$ ] $[{\rm H}_2/{\rm H}]$ $[{\rm HD}/{\rm H}]$
WMAP 3 + SDSS $1.92\times10^{-4}$ $7.97\times10^{-7}$ $7.52\times10^{-10}$
(PS07) $\sim$ $6\times10^{-5}$ $1.13\times10^{-6}$ $3.67\times10^{-10}$
(HP06) - $\sim$ $6\times10^{-7}$ -
(SSS) $1.92\times10^{-4}$ - -
Analytic approx. $2.0\times10^{-4}$ $2.9\times10^{-7}$ $3.0\times10^{-10}$
(GP98) $3.02\times10^{-4}$ $1.1\times10^{-6}$ $1.21\times10^{-9}$


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