\begin{table}%t1
\caption{\label{tab1}Summary of \ion{O}{iv} transitions.}
%\centering
\small
\begin{tabular}{l l}
\hline\hline
& \\[-8pt]
Wavelength (\AA)      &  Transition 
\\
\hline
& \\[-8pt]
554.51  & 2s$^{2}$2p $^{2}$P$_{3/2}$--2s2p$^{2}$ $^{2}$P$_{3/2}$     
\\
625.85  & 2s2p$^{2}$ $^{4}$P$_{5/2}$--2p$^{3}$ $^{4}$S$_{3/2}$     
\\
779.91  & 2s2p$^{2}$ $^{2}$D$_{5/2}$--2p$^{3}$ $^{2}$D$_{5/2}$     
\\
787.71  & 2s$^{2}$2p $^{2}$P$_{1/2}$--2s2p$^{2}$ $^{2}$D$_{3/2}$     
\\
790.20  & 2s$^{2}$2p $^{2}$P$_{3/2}$--2s2p$^{2}$ $^{2}$D$_{5/2}$     
\\
1343.5  & 2s2p$^{2}$ $^{2}$P$_{3/2}$--2p$^{3}$ $^{2}$D$_{5/2}$     
\\
1397.2  & 2s$^{2}$2p $^{2}$P$_{1/2}$--2s2p$^{2}$ $^{4}$P$_{3/2}$     
\\
1399.7  & 2s$^{2}$2p $^{2}$P$_{1/2}$--2s2p$^{2}$ $^{4}$P$_{1/2}$     
\\
1401.1  & 2s$^{2}$2p $^{2}$P$_{3/2}$--2s2p$^{2}$ $^{4}$P$_{5/2}$     
\\
1404.7  & 2s$^{2}$2p $^{2}$P$_{3/2}$--2s2p$^{2}$ $^{4}$P$_{3/2}$     
\\
1407.3  & 2s$^{2}$2p $^{2}$P$_{3/2}$--2s2p$^{2}$ $^{4}$P$_{1/2}$     
\\
\hline
\end{tabular}
\end{table}