Table 3: Abundances of ${\rm D}^+$ and ${\rm HeH}^+$ at z=100.
Cosmology/Ref. $[{\rm D}^+/{\rm H}]$ $[{\rm HeH}^+/{\rm H}]$

WMAP 3 + SDSS $5.15\times10^{-9}$ $4.27\times10^{-15}$

(PS07) $\sim$ $1.5\times10^{-9}$ $\sim$ $2.8\times10^{-15}$

Analytic approx. $3.7\times10^{-9}$ $4.5\times10^{-15}$

(GP98) $\sim$ $7.5\times10^{-9}$ $\sim$ $1.8\times10^{-14}$

**Table 3:** Abundances of ${\rm D}^+$ and ${\rm HeH}^+$ at z=100.
Cosmology/Ref.	$[{\rm D}^+/{\rm H}]$	$[{\rm HeH}^+/{\rm H}]$
WMAP 3 + SDSS	$5.15\times10^{-9}$	$4.27\times10^{-15}$
(PS07)	$\sim$ $1.5\times10^{-9}$	$\sim$ $2.8\times10^{-15}$
Analytic approx.	$3.7\times10^{-9}$	$4.5\times10^{-15}$
(GP98)	$\sim$ $7.5\times10^{-9}$	$\sim$ $1.8\times10^{-14}$

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