\begin{table}%t1
  \caption{\label{tab1}The measured lines are
    given in Col.~3. The last column gives the ratio of the line
    intensity to H$\beta$($=$100).}
\small
%\begin{center}
\par
\begin{tabular}{lrcc}
\hline
\hline
Ident. &  $\lambda$($\mu$m) & Intensity$^\dagger$ & I/H$\beta^\sharp$ \\
\hline
 ?                  & 9.98  & 6.52  & 0.96  \\
$[$\ion{S}{iv}$]$       & 10.51 & 1665  & 321   \\
\ion{H}{i} 9-7      & 11.30 & 4.27  & 0.806 \\
$[$\ion{Cl}{iv}$]$      & 11.76 & 4.50  & 0.844 \\
{H$_2$}         & 12.28 & 3.53  & 0.65  \\
\ion{H}{i}7-6(11-8) & 12.37 & 10.2  & 1.89  \\
$[$\ion{Ne}{ii}$]$      & 12.81 & 235   & 43.5  \\
$[$\ion{Ar}{v}$]$       & 13.10 & 3.41  & 0.63  \\
$[$\ion{Ne}{v}$]$       & 14.31 & 2.78  & 0.51  \\
$[$\ion{Cl}{ii}$]$      & 14.36 & 7.68  & 1.41  \\
$[$\ion{Ne}{iii}$]$     & 15.55 & 2708  & 497   \\
{H$_2$}         & 17.03 & 1.83  & 0.336 \\
$[$\ion{S}{iii}$]$      & 18.70 & 994   & 184   \\
$[$\ion{Cl}{iv}$]$      & 20.31 & 10.47 & 1.07  \\
$[$\ion{Ar}{iii}$]$     & 21.81 & 41.0  & 4.19  \\
$[$\ion{Fe}{iii}$]$     & 22.92 & 3.68  & 0.376 \\
$[$\ion{Ne}{v}$]$       & 24.31 & 3.89  & 0.396 \\
$[$\ion{O}{iv}$]$       & 25.87 & 900   & 91.5  \\
$[$\ion{Fe}{ii}$]$      & 25.98 & 2.51  & 0.255 \\
{H}{i}9-8       & 27.78 & 2.66  & 0.27  \\
$[$\ion{S}{iii}$]$      & 33.46 & 1185  & 120   \\
$[$\ion{Si}{ii}$]$      & 34.80 & 158   & 16.0  \\
$[$\ion{Ne}{iii}$]$     & 35.99 & 424   & 42.8  \\
\hline 
\end{tabular}%\end{center}
\par
\smallskip
$^\dagger$ The intensity is measured in units of
10$^{-14}$~erg~cm$^{-2}$~s$^{-1}$.\protect\\
$^\sharp$ In the ratio of intensity to H$\beta$ the intensities below~19~$\mu$m are multiplied by a factor~1.8 to correct for part of the
nebula being outside the diaphragm. A reddening correction is also
made but it is very small.
\end{table}