\begin{table}%t4
%\centering
\par
\caption{ Slope $\eta$ of the variability-luminosity relation for
the two $C_{\lambda}$ assumptions (see text).}
\label{Table6}
%\begin{center}
\par
\begin{tabular}{@{}lccc@{}}
\hline
\hline
\rule[-0.5em]{0pt}{1.6em}
& $\gamma$ & $\delta$ & $\eta$\\
\hline
\rule[-0.5em]{0pt}{1.6em}
$C_{\lambda}=0$                        & $0.96\pm 0.09$ & $0.21\pm 0.11$ & $-0.13\pm 0.06$\\
$C_{\lambda}=L_\lambda^{{\rm min}}$ & $1.02\pm 0.11$ & $0.21\pm 0.11$ & $-0.10\pm 0.05$\\
\hline
\end{tabular}
%\end{center}
\par
\end{table}