\begin{table}%t5
%\centering
\par
\caption{ N88A Ionic abundances: 10$^{-8}$ X/H. }\label{t5}
\begin{tabular}{lll}
\noalign{\smallskip}
\hline
\hline 
\noalign{\smallskip}
Abundance ratio                    &     N88A$^{91}$  & N88A$^{97}$      \\
\noalign{\smallskip}
\hline
\noalign{\smallskip}
              O$^{+}$/H                  &  534                         &    880                   \\
        O$^{++}$/H                       &8820                          &      8320                  \\
          S$^{+}$/H                       &5.10                         &      6.07                   \\
       S$^{++}$/H                        &   104                        &    103                    \\
\hline
\end{tabular}
\end{table}