\begin{table}%t9
\caption{\label{tb:elabun}Elemental abundances.}
%\centering
\small
\begin{tabular}{cc}
\hline\hline
Element           & Abundance relative to $n_\el{H}$ \\
\hline
\rule{0pt}{1em}He & \scit{1.00}{-1} \\
\element[][12]{C} & \scit{1.40}{-4} \\
\element[][13]{C} & \scit{2.03}{-6} \\
\element[][16]{O} & \scit{3.10}{-4} \\
\element[][17]{O} & \scit{1.55}{-7} \\
\element[][18]{O} & \scit{5.57}{-7} \\
\hline
\end{tabular}
\end{table}