\begin{table}%t1
\caption{\label{TCOR2_J0831}Hotspot separation measurements and error estimates of \object{CORALZ~J083139+460800}.}
%\centering
\par
\begin{tabular}{lcccc}
\hline \hline \noalign{\smallskip}
observation date & $\sigma_{\rm rms}$ & separation & $\sigma_{\rm separation}$ \\
 & (mJy) & (mas) & (mas) \\
\hline
2000 March 2  & 0.30 & 4.349 & 0.023 \\
2004 May 24   & 0.38 & 4.416 & 0.021 \\
2006 May 31   & 0.40 & 4.435 & 0.024 \\
2008 March 13 & 0.32 & 4.483 & 0.017 \\
\hline
\end{tabular}
\end{table}