\begin{table}%t1
  \caption{Comparison of IRAS and ISO--SWS
    fluxes,  in units of \units~for \object{NGC~6543}.}
  \label{iras}
  %\begin{center}
\par
    \begin{tabular}{c l c c c c}
      \hline
      \hline
      $\lambda$ & Ion & \multicolumn{2}{c}{SWS} &IRAS  &IRAS/SWS\\ \cline{3-4}
      ($\mu$m)&  & Aperture & Flux& Flux &\\
      \hline
      8.994 & \ion{Ar}{iii}& $14\arcsec \times 20\arcsec$ & 68.8  & 90  & 1.31 \\
      10.52 & \ion{S}{iv}  & $14\arcsec \times 20\arcsec$ & 385.2 & 430 & 1.11\\
      12.81 & \ion{Ne}{ii} & $14\arcsec \times 27\arcsec$ & 22.2  & 20  & 0.90\\
      15.56 & \ion{Ne}{iii}& $14\arcsec \times 27\arcsec$ & 631.8 & 530 & 0.84\\
      18.70 & \ion{S}{iii} & $14\arcsec \times 27\arcsec$ & 132.0 & 180 & 1.36\\
      \hline
    \end{tabular}
  %\end{center}
\par
\end{table}