\begin{table}%t13
%\centering
\par
\caption{Observed and model line ratios; $2.5 \leq z < 3.0$.\label{table:13}}
\begin{tabular}{l c c c c}
\hline\hline
  Parameter                                &
  Obs.                                     &
  Err.$^{{a}}$                      &
  \multicolumn{2}{c}{Models$^{{b}}$}\\
\hline
\multicolumn{5}{c}{$-24.5   >   M_B  \geq   -25.5$} \\
\hline
  $Z/Z_\odot$                       &       &       &   5.0 &   5.0 \\
  $\beta$                           &       &       &--1.00 &--1.04 \\
  $\Gamma$                          &       &       &--1.00 &--1.23 \\
  N{\sc v}/C{\sc iv}                & 0.561 & 0.028 & 0.499 & 0.608 \\
  (O{\sc i}+Si{\sc ii})/C{\sc iv}   & 0.121 & 0.010 & 0.163 & 0.122 \\
  C{\sc ii}/C{\sc iv}               & 0.065 & 0.010 & 0.199 & 0.190 \\
  (Si{\sc iv}+O{\sc iv}])/C{\sc iv} & 0.254 & 0.013 & 0.322 & 0.355 \\
  N{\sc iv}]/C{\sc iv}              & 0.021 & 0.010 & 0.152 & 0.152 \\
  He{\sc ii}/C{\sc iv}              & 0.151 & 0.010 & 0.186 & 0.187 \\
  (O{\sc iii}]+Al{\sc ii})/C{\sc iv}& 0.087 & 0.010 & 0.289 & 0.285 \\
  Al{\sc iii}/C{\sc iv}             & 0.078 & 0.010 & 0.101 & 0.099 \\
  Si{\sc iii}]/C{\sc iv}            & 0.070 & 0.010 & 0.266 & 0.219 \\
  C{\sc iii}]/C{\sc iv}             & 0.375 & 0.019 & 0.474 & 0.423 \\
\hline
\multicolumn{5}{c}{$-25.5   >   M_B   \geq   -26.5$} \\
\hline
  $Z/Z_\odot$                       &       &       &   5.0 &   2.0 \\
  $\beta$                           &       &       &--1.00 &--1.17 \\
  $\Gamma$                          &       &       &--1.00 &--1.64 \\
  N{\sc v}/C{\sc iv}                & 0.578 & 0.029 & 0.499 & 0.407 \\
  (O{\sc i}+Si{\sc ii})/C{\sc iv}   & 0.089 & 0.010 & 0.163 & 0.041 \\
  C{\sc ii}/C{\sc iv}               & 0.037 & 0.010 & 0.199 & 0.086 \\
  (Si{\sc iv}+O{\sc iv}])/C{\sc iv} & 0.252 & 0.013 & 0.322 & 0.248 \\
  N{\sc iv}]/C{\sc iv}              & 0.029 & 0.010 & 0.152 & 0.067 \\
  He{\sc ii}/C{\sc iv}              & 0.147 & 0.010 & 0.186 & 0.200 \\
  (O{\sc iii}]+Al{\sc ii})/C{\sc iv}& 0.098 & 0.010 & 0.289 & 0.178 \\
  Al{\sc iii}/C{\sc iv}             & 0.071 & 0.010 & 0.101 & 0.045 \\
  Si{\sc iii}]/C{\sc iv}            & 0.063 & 0.010 & 0.266 & 0.087 \\
  C{\sc iii}]/C{\sc iv}             & 0.351 & 0.018 & 0.474 & 0.258 \\
\hline
\multicolumn{5}{c}{$-26.5   >   M_B   \geq   -27.5$} \\
\hline
  $Z/Z_\odot$                   &       &       &   5.0 &   5.0 \\
  $\beta$                           &       &       &--1.00 &--1.11 \\
  $\Gamma$                          &       &       &--1.00 &--1.58 \\
  N{\sc v}/C{\sc iv}                & 0.858 & 0.043 & 0.499 & 0.820 \\
  (O{\sc i}+Si{\sc ii})/C{\sc iv}   & 0.095 & 0.010 & 0.163 & 0.081 \\
  C{\sc ii}/C{\sc iv}               & 0.055 & 0.010 & 0.199 & 0.183 \\
  (Si{\sc iv}+O{\sc iv}])/C{\sc iv} & 0.360 & 0.018 & 0.322 & 0.413 \\
  N{\sc iv}]/C{\sc iv}              & 0.022 & 0.010 & 0.152 & 0.153 \\
  He{\sc ii}/C{\sc iv}              & 0.151 & 0.010 & 0.289 & 0.278 \\
  (O{\sc iii}]+Al{\sc ii})/C{\sc iv}& 0.106 & 0.010 & 0.289 & 0.278 \\
  Al{\sc iii}/C{\sc iv}             & 0.101 & 0.010 & 0.101 & 0.096 \\
  Si{\sc iii}]/C{\sc iv}            & 0.108 & 0.010 & 0.266 & 0.155 \\
  C{\sc iii}]/C{\sc iv}             & 0.354 & 0.018 & 0.474 & 0.335 \\
\hline
\multicolumn{5}{c}{$-27.5   >   M_B   \geq   -28.5$} \\
\hline
  $Z/Z_\odot$                       &       &       &   5.0 &   5.0 \\
  $\beta$                           &       &       &--1.00 &--1.07 \\
  $\Gamma$                          &       &       &--1.00 &--1.54 \\
  N{\sc v}/C{\sc iv}                & 1.004 & 0.050 & 0.499 & 0.800 \\
  (O{\sc i}+Si{\sc ii})/C{\sc iv}   & 0.119 & 0.010 & 0.163 & 0.086 \\
  C{\sc ii}/C{\sc iv}               & 0.059 & 0.010 & 0.199 & 0.188 \\
  (Si{\sc iv}+O{\sc iv}])/C{\sc iv} & 0.401 & 0.020 & 0.322 & 0.421 \\
  N{\sc iv}]/C{\sc iv}              & 0.019 & 0.010 & 0.152 & 0.144 \\
  He{\sc ii}/C{\sc iv}              & 0.143 & 0.010 & 0.186 & 0.199 \\
  (O{\sc iii}]+Al{\sc ii})/C{\sc iv}& 0.104 & 0.010 & 0.289 & 0.271 \\
  Al{\sc iii}/C{\sc iv}             & 0.109 & 0.010 & 0.101 & 0.104 \\
  Si{\sc iii}]/C{\sc iv}            & 0.152 & 0.010 & 0.266 & 0.155 \\
  C{\sc iii}]/C{\sc iv}             & 0.328 & 0.016 & 0.474 & 0.309 \\
\hline
\multicolumn{5}{c}{$-28.5  >   M_B   \geq   -29.5$} \\
\hline
  $Z/Z_\odot$                   &       &       &  10.0 &  10.0 \\
  $\beta$                           &       &       &--1.00 &--1.03 \\
  $\Gamma$                          &       &       &--1.00 &--1.53 \\
  N{\sc v}/C{\sc iv}                & 1.248 & 0.062 & 0.837 & 1.191 \\
  (O{\sc i}+Si{\sc ii})/C{\sc iv}   & 0.112 & 0.010 & 0.250 & 0.122 \\
  C{\sc ii}/C{\sc iv}               & 0.074 & 0.010 & 0.317 & 0.290 \\
  (Si{\sc iv}+O{\sc iv}])/C{\sc iv} & 0.462 & 0.023 & 0.426 & 0.586 \\
  N{\sc iv}]/C{\sc iv}              & 0.012 & 0.010 & 0.298 & 0.251 \\
  He{\sc ii}/C{\sc iv}              & 0.125 & 0.010 & 0.178 & 0.180 \\
  (O{\sc iii}]+Al{\sc ii})/C{\sc iv}& 0.096 & 0.010 & 0.373 & 0.370 \\
  Al{\sc iii}/C{\sc iv}             & 0.165 & 0.010 & 0.168 & 0.175 \\
  Si{\sc iii}]/C{\sc iv}            & 0.204 & 0.010 & 0.375 & 0.211 \\
  C{\sc iii}]/C{\sc iv}             & 0.331 & 0.017 & 0.534 & 0.323 \\
\hline
\end{tabular}
\par
\smallskip
 $^{{a}}$ 
   Errors adopted for carrying out model fittings.
   Values are changed from those presented in
   Table 4; 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.
\par
\end{table}