\begin{table}%t4
\caption{\label{tab4}IUE spectrum of M~1-42.}  
\small%\centerline
{
\begin{tabular}{llccc}
\hline
\hline
\multicolumn{1}{c}{$\lambda$} & Ion &\multicolumn{3}{c}{Intensities}\\
\cline{3-5}
\multicolumn{1}{c}{(\AA)}& & (1)$^\dagger$ & (2)$^\sharp$ & (3)(I/H$\beta$)$^\star$   \\
\hline
1640 & \ion{He}{ii}   & 4.91  & 8.1  & 81   \\
1663 & \ion{O}{iii}]  & 2.89  & 4.7  & 47   \\
1863 & \ion{Al}{iii}] & 1.71  & 2.8  & 28   \\
1909 & \ion{C}{iii}]  & 2.77  & 4.56 & 45.6 \\
\hline 
\end{tabular}}
\smallskip
$^\dagger$ Measured intensity from low resolution spectra in units of~10$^{-14}$~erg~cm$^{-2}$~s$^{-1}$. \\
$^\sharp$ Intensity corrected for extinction in units of~10$^{-12}$~erg~cm$^{-2}$~s$^{-1}$. \\
$^\star$ Normalized to H$\beta=100$.\\ 
\end{table}