Table 4: Abundances of ${\rm D}^+$ and ${\rm HeH}^+$ at z=10.
Cosmology/Ref. $[{\rm D}^+/{\rm H}]$ $[{\rm HeH}^+/{\rm H}]$

WMAP 3 + SDSS $8.02\times10^{-16}$ $9.98\times10^{-15}$

(PS07) $\sim$ $1\times10^{-19}$ $4.6\times10^{-14}$

Analytic approx. $2.1\times10^{-20}$ $1.3\times10^{-14}$

(GP98) $\sim$ $5\times10^{-17}$ $\sim$ $6.5\times10^{-14}$

**Table 4:** Abundances of ${\rm D}^+$ and ${\rm HeH}^+$ at z=10.
Cosmology/Ref.	$[{\rm D}^+/{\rm H}]$	$[{\rm HeH}^+/{\rm H}]$
WMAP 3 + SDSS	$8.02\times10^{-16}$	$9.98\times10^{-15}$
(PS07)	$\sim$ $1\times10^{-19}$	$4.6\times10^{-14}$
Analytic approx.	$2.1\times10^{-20}$	$1.3\times10^{-14}$
(GP98)	$\sim$ $5\times10^{-17}$	$\sim$ $6.5\times10^{-14}$

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