\begin{table}%t11
\caption{Measured fluxes by adopting local continuum method.\label{table:11}}
%\centerline
{\begin{tabular}{l c c c}
\hline\hline
 Line Ratio &
 \multicolumn{2}{c}{our composite$^{{a}}$} &
 Vanden Berk et~al. (2001) \\
  &
 local cont. &
 Eq.~(1)$^{{b}}$ &
 local cont. \\
\hline
N{\sc v}/C{\sc iv}     & 
  0.097 $\pm$ 0.001 & 0.506 $\pm$ 0.004 & 0.097 $\pm$ 0.008 \\ 
Si{\sc ii}/C{\sc iv}   & 
  0.012 $\pm$ 0.001 & 0.089 $\pm$ 0.001 & 0.012 $\pm$ 0.000 \\ 
He{\sc ii}/C{\sc iv}   & 
  0.027 $\pm$ 0.001 & 0.147 $\pm$ 0.001 & 0.021 $\pm$ 0.001 \\ 
Al{\sc iii}/C{\sc iv}  & 
  0.016 $\pm$ 0.001 & 0.064 $\pm$ 0.001 & 0.013 $\pm$ 0.001 \\ 
Si{\sc iii}]/C{\sc iv} & 
  0.006 $\pm$ 0.001 & 0.093 $\pm$ 0.001 & 0.006 $\pm$ 0.001 \\ 
C{\sc iii}]/C{\sc iv}  & 
  0.424 $\pm$ 0.003 & 0.285 $\pm$ 0.005 & 0.630 $\pm$ 0.002 \\ 
\hline
\end{tabular}}
\par
\smallskip
$^{{a}}$
   The quasar composite spectrum for
   $2.0 \leq z < 2.5$ and 
   $-24.5 > M_B \geq -25.5$ is used.\\
$^{{b}}$
   The given values are the same as those in Table~3.
\end{table}