\begin{table}%t2
\par
\caption{Freeze-out values of free electrons, \HzI and \HDI at $z=10$.\label{tab:freeze10}}
%\centering
\par
\begin{tabular}{cccc}
\hline\hline
Cosmology/Ref. & [\e/\HI] & $[\fHzI/\fHI]$ & $[\fHDI/\fHI]$  \\ \hline
WMAP 3 + SDSS & $1.92\times10^{-4}$  & $7.97\times10^{-7}$ & $7.52\times10^{-10}$  \\
\citep{Puynew}  & $\sim$$6\times10^{-5}$  & $1.13\times10^{-6}$  & $3.67\times10^{-10}$ \\
\citep{Hirata} & --          &  $\sim$$6\times10^{-7}$ &     --           \\
\citep{SeagerFast}     & $1.92\times10^{-4}$  & --  &  --  \\
Analytic approx.  & $2.0\times10^{-4}$  & $2.9\times10^{-7}$  & $3.0\times10^{-10}$  \\ 
%CDM  & $4.54\times10^{-4}$  & $2.14\times10^{-6}$  & $8.1\times10^{-10}$   \\ 
\citep{Galli} & $3.02\times10^{-4}$ & $1.1\times10^{-6}$ & $1.21\times10^{-9}$ \\ \hline
\end{tabular} 
    \end{table}