\begin{table}%t4
\caption{\label{tab:chi2}Reduced $\chi^2_\nu$ values obtained for our grid of 
overall models. }
\small%\centering
\par
\begin{tabular}{lr|rrrr}
\hline\hline
Epoch   &       &    A     &    B     &    C     &    D     \\\hline 
M model &  M20  &   0.27   &  0.16    &   0.52   &  0.38       \\
        &  M21n &   0.26   &  0.14    &   0.53   & \fbox{0.35} \\
        &  M22  & \fbox{0.16} & 0.17     &  0.81   &  0.51    \\
        &  M23n &    0.17  &  0.12    & \fbox{0.43} &  0.61    \\
        &  M24n &    0.20  & \fbox{0.10} &   0.66   &  1.04    \\
        &  M25n &    0.19  &  0.17    &   0.53   &  0.58    \\\hline
\par
$R_{\rm in}$/$R_{\rm Phot}$     
        & 1.8   & \fbox{0.16} & 0.10     &  0.56    &  0.54    \\
        & 2.0   &   0.19   & \fbox{0.10} &  0.52    &  0.46    \\
        & 2.2   &   0.21   & 0.11     & \fbox{0.43} &  0.39    \\
        & 2.4   &   0.24   & 0.12     &  0.50    & \fbox{0.35} \\
        & 2.6   &   0.29   & 0.18     &  0.57    & 0.38     \\\hline
\par
$\tau_V$(Al$_2$O$_3$) 
        & 1.0   &  /       & /        & 0.77     &  0.48    \\
        & 1.5   &  0.18    & 0.11     & \fbox{0.43} & \fbox{0.35} \\
        & 2.0   &  0.17    & 0.11     & 0.56     & 0.54     \\
        & 2.5   & \fbox{0.16} & \fbox{0.10} & 0.80     & 0.71     \\
        & 3.0   &  0.18    & 0.11     &  /        &    /      \\\hline
\par
 $\tau_V$(Silicate)/           
        & 0\%   & \fbox{0.16} & \fbox{0.10} & \fbox{0.43} & \fbox{0.35}     \\
$\tau_V$(Al$_2$O$_3$) 
        &10\%  & 0.19      & 0.12     & 0.52     & 0.38 \\\hline
\par
$p$     & 2.0   & 0.31     &  0.20    &  0.87    & 0.38     \\
        & 2.5   & 0.20     &  0.14    &  0.54    & \fbox{0.35} \\
        & 3.0   & 0.17     & 0.10     & \fbox{0.43} & 0.39     \\
        & 3.5   & \fbox{0.16} & \fbox{0.10} &  0.50    & 0.51     \\
        & 4.0   & 0.20     & 0.12     &  /        &  /           \\\hline
\end{tabular}
\end{table}