\begin{table}%t7
\caption{Observed evolution of the lens, as a~function of the underlying assumption on $\sigma_{\rm c}$: FJ or GL~model with possible correction for central velocity dispersion~($f_{\rm SIE}$) and typical environment~(Env).}
\label{tab:ml}
%\centering
\small
\begin{tabular}{ccc}
\hline \hline
\noalign{\smallskip}
 Hypothesis & $\sigma_c$ (km~s$^{-1}$) & $\Delta \log (M/L)_r$ \\
\noalign{\smallskip}
\hline
GL & $355\pm35$ & $0.01\pm 0.06$ \\
GL+$f_{\rm SIE}$ & $309\pm28$ & $-0.1\pm0.08$\\
GL+$f_{\rm SIE}$+Env & $291\pm26$& $-0.14\pm 0.08$\\
FJ & $251\pm 29$& $-0.24\pm 0.08$\\
\hline
\end{tabular}
\end{table}