\begin{table}%t16
\caption{Observed and model line ratios; $4.0 \leq z < 4.5$.\label{table:16}}
%\centerline
{\begin{tabular}{l c c c c}
\hline\hline
  Parameter                                &
  Obs.                                     &
  Err.$^{{a}}$                      &
  \multicolumn{2}{c}{Models$^{{b}}$}\\
\hline
\multicolumn{5}{c}{$-25.5  >   M_B   \geq   -26.5$} \\
\hline
  $Z/Z_\odot$                       &       &       &   5.0 &   5.0 \\
  $\beta$                           &       &       &--1.00 &--1.06 \\
  $\Gamma$                          &       &       &--1.00 &--1.24 \\
  N{\sc v}/C{\sc iv}                & 0.724 & 0.036 & 0.499 & 0.614 \\
  (O{\sc i}+Si{\sc ii})/C{\sc iv}   & 0.148 & 0.010 & 0.163 & 0.119 \\
  C{\sc ii}/C{\sc iv}               & 0.067 & 0.010 & 0.199 & 0.188 \\
  (Si{\sc iv}+O{\sc iv}])/C{\sc iv} & 0.349 & 0.017 & 0.322 & 0.352 \\
  N{\sc iv}]/C{\sc iv}              & 0.019 & 0.010 & 0.152 & 0.155 \\
  He{\sc ii}/C{\sc iv}              & 0.132 & 0.010 & 0.186 & 0.185 \\
  (O{\sc iii}]+Al{\sc ii})/C{\sc iv}& 0.049 & 0.010 & 0.289 & 0.288 \\
\hline
\multicolumn{5}{c}{$-26.5   >   M_B   \geq   -27.5$} \\
\hline
  $Z/Z_\odot$                       &       &       &  10.0 &   5.0 \\
  $\beta$                           &       &       &--1.00 &--1.03 \\
  $\Gamma$                          &       &       &--1.00 &--1.40 \\
  N{\sc v}/C{\sc iv}                & 0.933 & 0.047 & 0.837 & 0.709 \\
  (O{\sc i}+Si{\sc ii})/C{\sc iv}   & 0.146 & 0.010 & 0.250 & 0.103 \\
  C{\sc ii}/C{\sc iv}               & 0.068 & 0.010 & 0.317 & 0.194 \\
  (Si{\sc iv}+O{\sc iv}])/C{\sc iv} & 0.383 & 0.019 & 0.426 & 0.404 \\
  N{\sc iv}]/C{\sc iv}              & 0.010 & 0.010 & 0.298 & 0.139 \\
  He{\sc ii}/C{\sc iv}              & 0.095 & 0.010 & 0.178 & 0.198 \\
  (O{\sc iii}]+Al{\sc ii})/C{\sc iv}& 0.064 & 0.010 & 0.373 & 0.269 \\
\hline
\multicolumn{5}{c}{$-27.5   >   M_B   \geq   -28.5$} \\
\hline 
  $Z/Z_\odot$                       &       &       &  10.0 &   5.0 \\
  $\beta$                           &       &       &--1.00 &--1.02 \\
  $\Gamma$                          &       &       &--1.00 &--1.54 \\
  N{\sc v}/C{\sc iv}                & 1.075 & 0.054 & 0.837 & 0.805 \\
  (O{\sc i}+Si{\sc ii})/C{\sc iv}   & 0.133 & 0.010 & 0.250 & 0.088 \\
  C{\sc ii}/C{\sc iv}               & 0.064 & 0.010 & 0.317 & 0.197 \\
  (Si{\sc iv}+O{\sc iv}])/C{\sc iv} & 0.409 & 0.020 & 0.426 & 0.445 \\
  N{\sc iv}]/C{\sc iv}              & 0.007 & 0.010 & 0.298 & 0.130 \\
  He{\sc ii}/C{\sc iv}              & 0.095 & 0.010 & 0.178 & 0.204 \\
  (O{\sc iii}]+Al{\sc ii})/C{\sc iv}& 0.075 & 0.010 & 0.373 & 0.257 \\
\hline
\end{tabular}}
\par
\smallskip
$^{{a}}$
   Errors adopted for carrying out model fittings.
   Values are changed from those presented in
   Table~\ref{table:07}; see text for details.\\
$^{{b}}$
   Model predictions with fixed $\beta$ and $\Gamma$
   and those with varying $\beta$ and $\Gamma$ are
   given in the left and right columns, respectively.
\end{table}