\begin{table}%t3
%\begin{center}
\par
  \caption{\label{table-lines} Selected spectral lines in the optical spectrum 
and their classification into broad-line (BLG) and narrow-line group 
(NLG), respectively, as described in Sect.~\ref{cycledesc}.
}
\begin{tabular}{ccl}
\hline\noalign{\smallskip}
\hline
 Wavelength &  Ion   &  Comment  \\
%
\hline 
3187.746 &  \ion{He}{i}     &  NLG, no phot. \\
3465.642 &  \ion{Ni}{ii}    &  NLG  \\
3468.678 &  \ion{Fe}{ii}    &  NLG  \\
3471.386 &  \ion{Ni}{ii}    &  NLG  \\
3513.987 &  \ion{Ni}{ii}    & NLG, strong \\
3530.505 &  \ion{He}{i}     & pure phot. \\
3554.412 &  \ion{He}{i}     & pure phot. \\
3587.268 &  \ion{He}{i}     & pure phot. \\
3634.238 &  \ion{He}{i}     & pure phot. \\
3968.469   &  \ion{Ca}{ii}&  BLG + NLG   \\
3994.997 &  \ion{N}{ii}     & pure phot. \\
4002.592    &  \ion{Si}{ii}   &  BLG   \\
4067.031   &  \ion{Ni}{ii}&  BLG + NLG   \\
4128.054   &  \ion{Si}{ii}&  BLG + NLG   \\
4130.872   &  \ion{Si}{ii}&  BLG + NLG   \\
4258.154    &  \ion{Fe}{ii}   &  BLG   \\
4294.099    &  \ion{Ti}{ii}   &  BLG   \\
4481.126    &  \ion{Mg}{ii}   &  BLG   \\
4824.127    &  \ion{Cr}{ii}   &  BLG   \\
5015.678 &  \ion{He}{i}     &  NLG + weak phot. \\
5100.727    &  \ion{Fe}{ii}   &  BLG   \\
5127.387 &  \ion{Fe}{iii}   &  NLG  \\
5156.111 &  \ion{Fe}{iii}   &  NLG  \\
5169.033   &  \ion{Fe}{ii}&  BLG + NLG   \\
5172.684    &  \ion{Mg}{i}    &  BLG   \\
5183.604    &  \ion{Mg}{i}    &  BLG   \\
5197.577   &  \ion{Fe}{ii}&  BLG + NLG   \\
5226.543    &  \ion{Ti}{ii}   &  BLG   \\
5316.615   &  \ion{Fe}{ii}&  BLG + NLG   \\
5679.558 &  \ion{N}{ii}     & pure phot. \\
5875.625 &  \ion{He}{i}     &  NLG + phot. \\
5889.951    &  \ion{Na}{i}    &  NLG   \\
5895.924    &  \ion{Na}{i}    &  NLG   \\
6147.741    &  \ion{Fe}{ii}   &  BLG   \\
6149.258    &  \ion{Fe}{ii}   &  BLG   \\
6156.755    &  \ion{O}{i}     &  BLG   \\
6158.187    &  \ion{O}{i}     &  BLG   \\
6347.109   &  \ion{Si}{ii}&  BLG + NLG   \\
6371.371   &  \ion{Si}{ii}&  BLG + NLG   \\
6678.154 &  \ion{He}{i}     &  NLG + phot. \\
7774.166 &  \ion{O}{i} & NLG  \\
\hline\noalign{\smallskip}
\end{tabular}
%\end{center}
\par
\end{table}