\begin{table}%t2
\caption{\label{tab2}Astrometric results.}
%\centerline
 {\begin{tabular}{lccc} \hline\hline
Date         & Separation    & PA & Remark \\
             & [mas]         & [$^{\circ}$] & \\ \hline
6-July-2001  & $1313 \pm 32$ & $45.15 \pm 2.0$ & (a) \\ 
27-July-2002 & $1384 \pm 39$ & $45    \pm 1.9$  & (b) \\
4-Sept.-2003  & $1369.5 \pm 7.3$ & $45.07 \pm 0.32$ & (b) \\
25-June-2004 & $1365.8 \pm 3.9$ & $45.4   \pm 0.25$  & (b) \\
13-June-2008 & $1373.4 \pm 7.2$ & $45.88 \pm 0.40$  & (b) \\ \hline
\end{tabular}}
\par
\smallskip
Remarks: (a) Means from data in Kr\"amer (\cite{Kramer08}) and 
K\"ohler et~al. (\cite{Kohler08}) using slightly different SHARP pixel scales. (b) this work.
\end{table}