\begin{table}%t2
%\centering
\par
\caption{Emission-line measurements of Sy2s.}
\label{table:2}
\begin{tabular}{l c c c c c c c}
\hline\hline
            \noalign{\smallskip}
  Object &
  Redshift &
  Ly$\alpha\lambda$1216$^{{a}}$ & 
  N{\sc v}$\lambda$1240$^{{a}}$ & 
  C{\sc iv}$\lambda$1549$^{{a}}$ & 
  He{\sc ii}$\lambda$1640$^{{a}}$ & 
  C{\sc iii}]$\lambda$1909$^{{a}}$ &
  Ref.$^{{b}}$ \\
            \noalign{\smallskip}
\hline
            \noalign{\smallskip}
NGC 1068 & 0.004 &
  713 $\pm$ 100 &
  224 $\pm$ 41 &
  520 $\pm$ 80 &
  187 $\pm$ 29 &
  240 $\pm$ 35 & 1 \\
NGC 4507$^{{c}}$ & 0.012 &
  75.6 $\pm$ 15.1 &
   5.2 $\pm$ 1.0 &
  13.5 $\pm$ 2.7 &
   5.6 $\pm$ 1.1 &
   5.8 $\pm$ 1.2 & 2 \\
NGC 5135$^{{c}}$ & 0.014 &
  59.0 $\pm$ 11.8 &
   1.1 $\pm$ 0.2 &
   4.1 $\pm$ 0.8 &
  10.0 $\pm$ 2.0 &
  --- & 3 \\
NGC 5506$^{{c}}$ & 0.006 &
  --- &
  --- &
  4.5 $\pm$ 1.4$^{{d}}$ &
  2.0 $\pm$ 0.6$^{{d}}$ &
  3.6 $\pm$ 0.7 & 2 \\
NGC 7674 & 0.029 &
  47.0 $\pm$ 20.3  &
  ---            &
  11.4 $\pm$ 3.3   &
   5.1 $\pm$ 1.5   &
   7.9 $\pm$ 2.7   & 4 \\
Mrk 3    & 0.014 &
  64 $\pm$ 19$^{{d}}$ & 
   3 $\pm$ 1$^{{d}}$ &
  21 $\pm$ 2 &
   9 $\pm$ 1 &
   9 $\pm$ 1 & 5 \\
Mrk 573 & 0.017 &
  151.2 $\pm$ 22.7 & 
    6.3 $\pm$ 0.9 & 
   29.0 $\pm$ 4.3 & 
   12.6 $\pm$ 1.9 & 
    8.8 $\pm$ 1.3 &  6 \\
Mrk 1388 & 0.021 &
  --- & 
  --- & 
  8.3 $\pm$ 1.2 & 
  3.8 $\pm$ 0.6 & 
  3.6 $\pm$ 0.5 & 6 \\
MCG --3--34--64$^{{c}}$ & 0.017 &
  56 $\pm$ 11 & 
   5 $\pm$ 1 & 
  14 $\pm$ 3 & 
  10 $\pm$ 2 & 
   7 $\pm$ 1 & 7 \\
\hline
\end{tabular}
\begin{list}{}{}
\item[$^{{a}}$]  
  Fluxes are in units of 10$^{-14}$ erg s$^{-1}$~cm$^{-2}$.
\item[$^{{b}}$]  
  References. ---
  (1) Snijders et~al. (\cite{Snijders1986}),
  (2) Bergeron et~al. (\cite{Bergeron1981}),
  (3) Thuan (\cite{Thuan1984}),
  (4) Kraemer et~al. (\cite{Kraemer1994}),
  (5) Malkan \& Oke (\cite{Malkan1983}),
  (6)~McAlpine (\cite{McAlpine1988}),
  (7) De Robertis et~al. (\cite{Robertis1988}).
\item[$^{{c}}$]  
  20\% of the line flux is assigned as the flux error.
\item[$^{{d}}$]  
  30\% of the line flux is assigned as the flux error.
\end{list}
\end{table}