\begin{table}%t9 \caption{\label{lensmodel_best}Best mass model.} \small%\centerline { \begin{tabular}{cccccccc} \hline \hline \noalign{\smallskip} Clump & X & Y & $\epsilon$ & $\theta$ & $\sigma_0$ & $r_{\rm core}$ & $r_{\rm cut}$ \\ & ($\arcsec$) & ($\arcsec$) & & (deg) & (km~s$^{-1}$) & (kpc) & (kpc) \\ \hline \noalign{\smallskip} Cluster & $-0.771414$ & 2.256631 & 0.695267 & 31.146240 & 1117.322994 & 7.667450 & [1500] \\ \noalign{\smallskip} $L^*$ elliptical galaxy & -- & -- &-- & -- & 150.421411 & [0] & 3.880257 \\ \hline \end{tabular}} \smallskip The columns show: position respect to the brightest cluster galaxy (X,Y), ellipticity of the mass distribution ($\epsilon$, expressed as $a^2-b^2/a^2+b^2$, were $a$ and $b$ are the semi-major and semi minor axes of the ellipse that describes the light distribution of the clump), position angle ($\theta$), velocity dispersion ($\sigma_0$), core radius ($r_{\rm core}$) and scale radius ($r_{\rm cut}$). Values into brackets are not optimized. The coordinates of the brightest cluster galaxy are $\rm RA=4^{h} 54^{m} 10.87^{s}$, $\rm DEC=-3^{\circ} 0\arcmin 54.00\arcsec$. \end{table}