\begin{table}%t8
%Table 8\\
\caption{Electron density indicators in NGC~6369.\label{tab8}}
%\centerline
 {\begin{tabular}{lcccc}
\hline
\hline
Ion &Ioniz. & Lines& Observed &$N_{{\rm e}}$ \\
&Pot. (eV) & used  & ratio & (cm$^{-3}$)\\
\hline
\ion{[S}{ii]} & 10.4 & 6731/6716 & 1.51  & 2300\\
\ion{[O}{ii]} & 13.6 & 3626/3729 & 1.62 & 2800 \\
\ion{[S}{iii]} & 23.3 & 33.5/18.7 & 0.409 & 2900 \\
\ion{[Cl}{iii]} & 23.8 & 5538/5518 & 1.3: & 3000:\\
\ion{[O}{iii]} & 35.1 & 51.8/88.4 & 2.1 & 800:\\
\ion{[Ar}{iv]} & 40.7 & 4711/4740 & 0.87 & 4000:\\ 
\hline
\end{tabular}}
\par
\smallskip
: Indicates uncertain values. Wavelength units as in Table~\ref{tab7}.
\end{table}