\begin{table}%t1
\caption{ISO observations of \object{NGC~6826} (in units of 10$^{-13}$~erg~cm$^{-2}$~s$^{-1}$).}\label{tab1} 
\small%\centerline
 {
\begin{tabular}{lrcc}
\hline
\hline
Ident. &  $\lambda$($\mu$m) & Intens.~(1) & Intens.~(2) \\
\hline
\ion{H}{i} 6--4 & 2.626 & 31.5 & 3.7 \\
\ion{H}{i} 10--5  & 3.039 & 6.9: &  \\
\ion{H}{i} 9--5 & 3.297 & 7.5 & 0.88 \\
\ion{H}{i} 8--5 &3.740  & 8.7 & 1.02 \\
\ion{H}{i} 5--4 & 4.052 & 65. & 8.5 \\
\ion{H}{i} 6--5 & 7.460 & 17.8 & 2.09 \\
$[$\ion{Ar}{iii}$]$ & 8.992 & 91.0 & 10.7 \\
$[$\ion{S}{iv}$]$   & 10.510  & 295. & 34.7 \\
$[$\ion{Ne}{ii}$]$ & 12.813 & 41.0 & 4.10 \\
$[$\ion{Ne}{iii}$]$ & 15.555 & 1100. & 110.. \\
$[$\ion{P}{iii}$]$ & 17.887 & 10. & 1.0 \\
$[$\ion{S}{iii}$]$ & 18.713 & 167. & 16.7 \\
$[$\ion{Ar}{iii}$]$ & 21.837 & 10.5 & 1.05 \\
$[$\ion{S}{iii}$]$ & 33.481 & 127. & 11.6 \\
$[$\ion{Ne}{iii}$]$ & 36.104 & 110. & 10.0 \\
$[$\ion{O}{iii}$]$ & 51.833 & 2170. & 170. \\
$[$\ion{N}{iii}$]$ & 57.326 & 408. & 31.9 \\
$[$\ion{O}{iii}$]$ & 88.375 & 763. & 59.6 \\ 
$[$\ion{C}{ii}$]$ & 157.851 & 6.11: & 0.48: \\
\hline
\end{tabular}}
\medskip
Intens.~(1) is the average value of the measured intensity. Intens.~(2) is the 
value of the intensity divided by H$\beta$, where H$\beta$~= 100.\\ : indicates uncertain value.
\end{table}