\begin{table}%t10
\par
\caption{\label{tab_lensmodel_imgs}Results of the best models for each set of constraints. }
\small %\centerline
{
\begin{tabular}{ccccccc}
\hline\hline
\noalign{\smallskip}
System & $\chi^2$ & $\chi^2$ & $\chi^2$ & rms   & rms  & rms     \\
       & {{\textsc{mfinal}}}    & {{\textsc{mzfix}}}     & {{\textsc{mzfree}}}    & {{\textsc{mfinal}}} & {{\textsc{mzfix}}} & {{\textsc{mzfree}}}         \\
\noalign{\smallskip}
\hline 
\noalign{\smallskip}
1 & 3.89 & 6.71  & 4.04 & 0.34 & 0.45 & 0.35 \\ 
2 & 2.02 & 0.68  & 1.28 & 0.25 & 0.14 &	0.20 \\
3 & 1.33 & 0.74  & 0.95 & 0.20 & 0.15 &	0.17 \\
4 & 3.86 & 8.53  & 6.32 & 0.34 & 0.51 &	0.44 \\
5 & 0.50 & 1.48  & 0.62 & 0.12 & 0.21 & 0.14 \\      
6 &	 & 35.46 & 3.70 &      & 1.26 &	0.41 \\
\hline 
\end{tabular}}
\smallskip
The
columns show: ID of each set of constraints (System), reduced $\chi^2$
obtained for each model ($\chi^2$ final, zfix and zfree) and average
separation between the observed and predicted position of the lensed
images for each model (rms final, zfit and zfree).
\end{table}