\begin{table}%t3
\caption{\label{tab3}Visual spectrum of NGC~6210.}
\small%\centerline
 {
\begin{tabular}{llcc}
\hline
\hline
&&& \\[-8pt]
{$\lambda$} & Ion & Meas.Intens.$^\dagger$)& Corr. Intens. \\ 
\hline
3726  & \ion{[O}{ii]} & 23.1  & 25.0   \\
3729  & \ion{[O}{ii]} &  11.6  & 12.5  \\
3869 & \ion{[Ne}{iii]} & 80.9  &  86.7  \\
4101 & \ion{H}{$\delta$}& 24.4  &  25.8  \\
4267 & \ion{C}{ii}    & 0.327  & 0.341  \\
4340 & \ion{H}{$\gamma$}& 45.7 & 47.5 \\
4363 & \ion{[O}{iii]} & 5.85 & 6.08  \\
4481 & \ion{Mg}{ii}   & 0.19 & 0.020  \\
4686 & \ion{He}{ii}  & 1.48  &  1.50    \\
4711 & \ion{[Ar}{iv]} & 1.16  & 1.173  \\
4740 & \ion{[Ar}{iv]} & 1.52  &  1.534  \\
4861 & \ion{H}{$\beta$} & 100 & 100  \\
5007 & \ion{[O}{iii]} &      & 1084  \\
5276 & \ion{[Fe}{vii]} &  0.015  & 0.015 \\
5517 & \ion{[Cl}{iii]} & 0.419 &  0.400  \\
5538 & \ion{[Cl}{iii]} & 0.492  & 0.469  \\
5755 & \ion{[N}{ii]}  & 0.417  & 0.393   \\
5876 & \ion{He}{i}    & 14.6  &  13.7   \\
6312 & \ion{[S}{iii]} & 1.19  & 1.093   \\
6563 & \ion{H}{$\alpha$}& 304  &  276   \\
6584 & \ion{[N}{ii]}  & 20.6  &  18.7   \\
6717 & \ion{[S}{ii]}  & 2.42  &  2.185   \\
6731 & \ion{[S}{ii]}  & 4.01  & 3.618  \\
6794 & \ion{[K}{iv]}   & 0.029  & 0.026  \\
7135 & \ion{[Ar}{iii]}& 12.0  & 10.66   \\
7237 & \ion{[Ar}{iv]}  & 0.099  & 0.088  \\
7530 & \ion{[Cl}{iv]}  & 0.256  &  0.224  \\
9532 & \ion{[S}{iii]} & 44.3   & 49.6   \\
\hline
\end{tabular}}
\medskip
$^{\dagger}$ References: all values are taken from Liu et~al. (\cite{liu}) except for $\lambda$9532 taken from Hippelein \& Munch (\cite{hippelein}). \\ 
$^{\ast}$ This is a blend of $\lambda$3726 and $\lambda$3729~lines.
\end{table}