\begin{table}%[t!]
\caption{\label{tab:abon-chimi}Elemental abundances with respect to total hydrogen}
%\centering

\begin{tabular}{ccccccc}
\hline
\hline
\vspace{-0.25cm}\\
C & O & N & Mg & S & Si & Fe \\
$1.38 \times 10^{-4}$ & $3.02 \times 10^{-4}$ &$7.95 \times 10^{-5}$ & $1.00 \times 10^{-8}$ & $2.00 \times 10^{-6}$ &
$1.73 \times 10^{-8}$ & $1.70 \times 10^{-9}$\\
\hline
\end{tabular}
\end{table}