\begin{table}%t4
       \caption{Infrared measured line intensities for \nsix. In the last
        column the dereddened and aperture corrected fluxes
        (Flux$^{\rm corr}$) are given. The $E_{B-V}=0.07$, and the
        aperture correction factor is {1.3} for ions measured with the
        smallest ISO SWS aperture ($<$12 $\mu$m).}
      \label{irflux_n6}
  %\centerline
{    \begin{tabular}{c l c c }
        \hline
        \hline
        \makebox{\rule[0cm]{0cm}{0.33 cm}$\lambda (\mu$m)}& Ident. & Flux$^{\rm obs}$ & Flux$^{\rm corr}$\\
                \hline
        2.625            & \ion{H}{i} (Br$\beta$)   & 10.6    & 13.9\\
        3.038            & \ion{H}{i} (10-5)        & 1.56    & 2.04\\
        3.296            & \ion{H}{i} (Pf$\delta$)  & 1.41:   & 1.85\\
        3.739            & \ion{H}{i} (Pf$\gamma$)  & 2.57    & 3.36\\
        4.051            & \ion{H}{i} (Br$\alpha$)  & 17.7    & 23.2\\
        4.486            & \ion{Mg}{iv}             & $<$1.88 & $<$2.45\\
        4.653            & \ion{H}{i} (Pf$\beta$)   & 4.32    & 5.64\\
        6.984            & \ion{[Ar}{ii]}           & 3.60:   & 4.69\\
        7.312            & \ion{[Na}{iii]}          & 3.28    & 4.27\\
        7.459            & \ion{H}{i} (Pf$\alpha$)  & 5.79    & 7.54\\
        7.502            & \ion{H}{i} (8-6)         & 2.43    & 3.17\\
        8.990            & \ion{[Ar}{iii]}          & 68.8    & 90.3\\
        10.51            & \ion{[S}{iv]}            & 385.2   & 505.6\\
        12.81            & \ion{[Ne}{ii]}           & 22.2    & 22.3\\
        15.55            & \ion{[Ne}{iii]}          & 631.8   & 634.0\\ 
        18.70            & \ion{[S}{iii]}           & 132.0   & 132.6\\
        19.06            & \ion{H}{i} (8-7)         & 1.82    & 1.83\\
        21.83            & \ion{[Ar}{iii]}          & 4.41    & 4.43\\
        22.32            & \ion{H}{i}, \ion{He}{ii} & 0.41:   & 0.41\\
        25.89            & \ion{O}{iv}              & $<$0.36 & $<$0.36\\
        33.48            & \ion{[S}{iii]}           & 51.2    & 51.3\\
        34.81            & \ion{[Si}{ii]}           & 1.21:   & 1.21:\\
        36.01            & \ion{[Ne}{iii]}          & 52.8    & 52.9\\ 
        51.80$^\dagger$  & \ion{[O}{iii]}           & 504.7   & 505.2\\
        57.31$^\dagger$  & \ion{[N}{iii]}           & 120.6   & 126.7\\
        88.33$^\dagger$  & \ion{[O}{iii]}           & 144.3   & 144.3\\
        \hline
      \end{tabular}}
    $^\dagger$From the LWS spectrum.\\
    : Noisy.
  \end{table}