\begin{table}%t1
\caption{Ionic abundances in G84.0$+$0.8.}\label{tab1}
%\centering
\par
\begin{tabular}{lc}
\hline \hline 
Ion  & 12$+$Log(X/H)\\
\hline
He$^{+}$ & 0.11\\
N$^{+}$  & 7.40\\
O$^+$    & 8.90\\
O$^{++}$ & 8.10\\
S$^{+}$  & 6.12\\
\hline
\end{tabular}
\end{table}