\begin{table}%t2
\caption{\label{table_i_eta}Thermal inertia $I$ and beaming factor $\eta$ of asteroid 21 Lutetia derived from the SST data, for two different values of the geometric albedo.}
\par
%\centerline
{\small
\begin{tabular}{ccccc}
\hline\hline
\noalign{\smallskip}
       &\multicolumn{2}{c}{Nominal value $p_{\rm v}=0.13$$^{\dag}$} &\multicolumn{2}{c}{Extreme value $p_{\rm v}=0.26$$^{\ddag}$} \\
\noalign{\smallskip}
$I$                           &$\eta$\tablefootmark{a} &$\chi^2$   &$\eta^{a}$ &$\chi^2$\\
(JK$^{-1}$m$^{-2}$s$^{-1/2}$) &       &(Jy$^2$)   &       &(Jy$^2$)\\
\noalign{\smallskip}
\hline
\noalign{\smallskip}
0	&$0.83\pm0.05$ &69 &$0.78\pm0.05$ &69\\
10	&$0.76\pm0.05$ &79 &$0.72\pm0.05$ &79\\
20	&$0.71\pm0.05$ &83 &$0.67\pm0.05$ &83\\
30	&$0.67\pm0.05$ &84 &$0.63\pm0.05$ &84\\
40	&$0.64\pm0.05$ &83 &$0.60\pm0.05$ &84\\
50	&$0.61\pm0.05$ &82 &$0.57\pm0.05$ &81\\
\hline
\end{tabular}}
\tablefoot{\tablefoottext{a}{The uncertainty of $\pm$0.05 on $\eta$ is obtained by doubling the $\chi^2$ value.}}
\vspace{-4mm}
\tablebib{$^{\dag}$: Lamy et~al. (\cite{Lamy2010}); $^{\ddag}$: Mueller et~al. (\cite{Mueller2006}).}
\vspace{2mm}
\end{table}