\begin{table}%t3
\caption{Initial abundances of H$_2$ and elements.}
\label{tab3}
\small%\begin{center}
{
\begin{tabular}{l c}
\hline\hline
& \\[-8pt]
Species $i$ & $n_{i}/n_{\rm H}$ $^{\dag}$ \\
\hline
H$_2$ & $0.5$ \\
He & $0.09$ \\
C & $1.4(-4)$ \\
N & $7.5(-5)$ \\
O & $3.2(-4)$ \\
S & $1.5(-6)$ \\
Na & $2.0(-8)$ \\
Mg & $2.55(-6)$ \\
Si & $1.95(-6)$ \\
P & $2.3(-8)$ \\
Cl & $1.4(-8)$ \\
Fe & $7.4(-7)$ \\
\hline
\end{tabular}}
%\medskip
\par
{
$^{\dag}$ $a(b) = a \times 10^{b}$.}
%\end{center}
\par
\end{table}