\begin{table}%t12
%\centering
\par
\caption{Observed and model line ratios; $2.0 \leq z < 2.5$.\label{table:12}}
\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
  $Z/Z_\odot$                       &       &       &   2.0 &   2.0 \\
  $\beta$                           &       &       &--1.00 &--1.17 \\
  $\Gamma$                          &       &       &--1.00 &--1.66 \\
  N{\sc v}/C{\sc iv}                & 0.506 & 0.025 & 0.222 & 0.420 \\
  (O{\sc i}+Si{\sc ii})/C{\sc iv}   & 0.061 & 0.010 & 0.091 & 0.041 \\
  C{\sc ii}/C{\sc iv}               & 0.033 & 0.010 & 0.103 & 0.087 \\
  (Si{\sc iv}+O{\sc iv}])/C{\sc iv} & 0.256 & 0.013 & 0.215 & 0.252 \\
  N{\sc iv}]/C{\sc iv}              & 0.016 & 0.010 & 0.062 & 0.066 \\
  He{\sc ii}/C{\sc iv}              & 0.147 & 0.010 & 0.181 & 0.203 \\
  (O{\sc iii}]+Al{\sc ii})/C{\sc iv}& 0.088 & 0.010 & 0.196 & 0.176 \\
  Al{\sc iii}/C{\sc iv}             & 0.064 & 0.010 & 0.052 & 0.046 \\
  Si{\sc iii}]/C{\sc iv}            & 0.093 & 0.010 & 0.157 & 0.085 \\
  C{\sc iii}]/C{\sc iv}             & 0.285 & 0.014 & 0.330 & 0.249 \\
\hline
\multicolumn{5}{c}{$-25.5   >   M_B  \geq   -26.5$} \\
\hline
  $Z/Z_\odot$                   &       &       &   5.0 &   5.0 \\
  $\beta$                           &       &       &--1.00 &--1.08 \\
  $\Gamma$                          &       &       &--1.00 &--1.51 \\
  N{\sc v}/C{\sc iv}                & 0.717 & 0.036 & 0.499 & 0.776 \\
  (O{\sc i}+Si{\sc ii})/C{\sc iv}   & 0.081 & 0.010 & 0.163 & 0.089 \\
  C{\sc ii}/C{\sc iv}               & 0.047 & 0.010 & 0.199 & 0.187 \\
  (Si{\sc iv}+O{\sc iv}])/C{\sc iv} & 0.334 & 0.017 & 0.322 & 0.409 \\
  N{\sc iv}]/C{\sc iv}              & 0.013 & 0.010 & 0.152 & 0.148 \\
  He{\sc ii}/C{\sc iv}              & 0.152 & 0.010 & 0.186 & 0.197 \\
  (O{\sc iii}]+Al{\sc ii})/C{\sc iv}& 0.093 & 0.010 & 0.289 & 0.275 \\
  Al{\sc iii}/C{\sc iv}             & 0.092 & 0.010 & 0.101 & 0.101 \\ 
  Si{\sc iii}]/C{\sc iv}            & 0.117 & 0.010 & 0.266 & 0.163 \\
  C{\sc iii}]/C{\sc iv}             & 0.326 & 0.016 & 0.474 & 0.332 \\
\hline
\multicolumn{5}{c}{$-26.5   >   M_B   \geq  -27.5$} \\
\hline
  $Z/Z_\odot$                       &       &       &   5.0 &   5.0 \\
  $\beta$                           &       &       &--1.00 &--1.10 \\
  $\Gamma$                          &       &       &--1.00 &--1.61 \\
  N{\sc v}/C{\sc iv}                & 0.887 & 0.044 & 0.499 & 0.843 \\
  (O{\sc i}+Si{\sc ii})/C{\sc iv}   & 0.086 & 0.010 & 0.163 & 0.078 \\
  C{\sc ii}/C{\sc iv}               & 0.052 & 0.010 & 0.199 & 0.184 \\
  (Si{\sc iv}+O{\sc iv}])/C{\sc iv} & 0.375 & 0.019 & 0.322 & 0.424 \\
  N{\sc iv}]/C{\sc iv}              & 0.015 & 0.010 & 0.152 & 0.150 \\
  He{\sc ii}/C{\sc iv}              & 0.149 & 0.010 & 0.186 & 0.200 \\
  (O{\sc iii}]+Al{\sc ii})/C{\sc iv}& 0.094 & 0.010 & 0.289 & 0.274 \\
  Al{\sc iii}/C{\sc iv}             & 0.105 & 0.010 & 0.101 & 0.099 \\
  Si{\sc iii}]/C{\sc iv}            & 0.127 & 0.010 & 0.266 & 0.148 \\
  C{\sc iii}]/C{\sc iv}             & 0.326 & 0.016 & 0.474 & 0.314 \\
\hline
\multicolumn{5}{c}{$-27.5   >   M_B   \geq   -28.5$} \\
\hline
  $Z/Z_\odot$                   &       &       &   5.0 &   5.0 \\
  $\beta$                           &       &       &--1.00 &--1.11 \\
  $\Gamma$                          &       &       &--1.00 &--1.63 \\
  N{\sc v}/C{\sc iv}                & 0.983 & 0.049 & 0.499 & 0.858 \\
  (O{\sc i}+Si{\sc ii})/C{\sc iv}   & 0.085 & 0.010 & 0.163 & 0.076 \\
  C{\sc ii}/C{\sc iv}               & 0.050 & 0.010 & 0.199 & 0.184 \\
  (Si{\sc iv}+O{\sc iv}])/C{\sc iv} & 0.398 & 0.020 & 0.322 & 0.427 \\
  N{\sc iv}]/C{\sc iv}              & 0.020 & 0.010 & 0.152 & 0.150 \\
  He{\sc ii}/C{\sc iv}              & 0.140 & 0.010 & 0.186 & 0.201 \\
  (O{\sc iii}]+Al{\sc ii})/C{\sc iv}& 0.101 & 0.010 & 0.289 & 0.275 \\
  Al{\sc iii}/C{\sc iv}             & 0.124 & 0.010 & 0.101 & 0.098 \\
  Si{\sc iii}]/C{\sc iv}            & 0.130 & 0.010 & 0.266 & 0.145 \\
  C{\sc iii}]/C{\sc iv}             & 0.348 & 0.017 & 0.474 & 0.311 \\
\hline
\multicolumn{5}{c}{$-28.5   >   M_B   \geq   -29.5$} \\
\hline
  $Z/Z_\odot$                   &       &       &   5.0 &   5.0 \\
  $\beta$                           &       &       &--1.00 &--1.06 \\
  $\Gamma$                          &       &       &--1.00 &--1.50 \\
  N{\sc v}/C{\sc iv}                & 1.145 & 0.057 & 0.499 & 0.770 \\
  (O{\sc i}+Si{\sc ii})/C{\sc iv}   & 0.145 & 0.010 & 0.163 & 0.091 \\
  C{\sc ii}/C{\sc iv}               & 0.089 & 0.010 & 0.199 & 0.189 \\
  (Si{\sc iv}+O{\sc iv}])/C{\sc iv} & 0.419 & 0.021 & 0.322 & 0.413 \\
  N{\sc iv}]/C{\sc iv}              & 0.000 & 0.010 & 0.152 & 0.144 \\
  He{\sc ii}/C{\sc iv}              & 0.133 & 0.010 & 0.186 & 0.198 \\
  (O{\sc iii}]+Al{\sc ii})/C{\sc iv}& 0.104 & 0.010 & 0.289 & 0.272 \\
  Al{\sc iii}/C{\sc iv}             & 0.146 & 0.010 & 0.101 & 0.105 \\
  Si{\sc iii}]/C{\sc iv}            & 0.110 & 0.010 & 0.266 & 0.163 \\
  C{\sc iii}]/C{\sc iv}             & 0.395 & 0.020 & 0.474 & 0.318 \\
\hline
\end{tabular}
\par
\smallskip
 $^{{a}}$
   Errors adopted for carrying out model fittings.
   Values are changed from those presented in
   Table 3; 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}