\begin{table}%t3
\caption{\label{tab:astrometry}Astrometric measurements for the {\toric} binary system.}
%\centerline
 {
\begin{tabular}{llccllc}
  \hline\hline
  Telescope           & Date        & Filter & Flux ratio            & \multicolumn{1}{c}{$\Theta$}      & \multicolumn{1}{c}{$\rho$}         & Ref.\\
                      &             &        & $F_{\rm C2}/F_{\rm C1}$ & \multicolumn{1}{c}{[\degr]}       & \multicolumn{1}{c}{[mas]}          & \\
  \hline
  BTA~6~m/Speckle    & 1997.784    & $H$    & $0.26 \pm 0.02$ & $226.0 \pm 3$   & $33 \pm 2$ & a\\
  BTA~6~m/Speckle    & 1998.838    & $K'$   & $0.32 \pm 0.03$ & $222.0 \pm 5$   & $37 \pm 4$ & a\\
  BTA~6~m/Speckle    & 1999.737    & $J$    & $0.31 \pm 0.02$ & $214.0 \pm 2$   & $43 \pm 1$ & b\\
  BTA~6~m/Speckle    & 1999.8189   & $G'$   & $0.35 \pm 0.04$ & $213.5 \pm 2$   & $42 \pm 1$ & c\\
  BTA~6~m/Speckle    & 2000.8734   & $V'$   & $0.35 \pm 0.03$ & $210.0 \pm 2$   & $40 \pm 1$ & c\\
  BTA~6~m/Speckle    & 2001.184    & $J$    & $0.29 \pm 0.02$ & $208.0 \pm 2$   & $38 \pm 1$ & b\\
  BTA~6~m/Speckle    & 2003.8      & $J$    & $0.30 \pm 0.02$ &  $19.3 \pm 2$   & $29 \pm 2$ & c\\
  BTA~6~m/Speckle    & 2003.9254   & $V'$   & --              &  $19.0 \pm 2$   & $29 \pm 2$ & c\\
  BTA~6~m/Speckle    & 2003.928    & $V'$   & --              &  $19.1 \pm 2$   & $29 \pm 2$ & c\\
  BTA~6~m/Speckle    & 2004.8216   & $V'$   & $0.34 \pm 0.04$ &  $10.5 \pm 4$   & $24 \pm 4$ & c\\
  IOTA                & 2005.92055  & $H$    & $0.28 \pm 0.03$ & $342.74 \pm 2$  & $13.55 \pm 0.5$ & c\\
  NPOI                & 2006.1486   & $V$    & --              & $332.3 \pm 3.5$ & $11.80 \pm 1.11$ & d\\
  VLTI/AMBER          & 2007.0192   & $K$    & $0.31 \pm 0.03$ & $274.9 \pm 1$    & $11.04 \pm 0.5$ & --\\
  NPOI                & 2007.1425   & $V$    & --              & $268.1 \pm 5.2$  & $11.94 \pm 0.31$ & d\\
  NPOI                & 2007.1507   & $V$    & --              & $272.9 \pm 8.8$  & $12.13 \pm 1.58$ & d\\
  NPOI                & 2007.1753   & $V$    & --              & $266.6 \pm 2.1$  & $12.17 \pm 0.37$ & d\\
  NPOI                & 2007.2055   & $V$    & --              & $265.6 \pm 1.9$  & $12.28 \pm 0.41$ & d\\
  NPOI                & 2007.2137   & $V$    & --              & $263.0 \pm 2.3$  & $12.14 \pm 0.43$ & d\\
  BTA~6~m/Speckle    & 2007.9014   & $V'$        & $0.29 \pm 0.02$      & $238.0 \pm 2$    & $19.8 \pm 2$  &  --\\
  VLTI/AMBER          & 2007.9233   & $H$+$K$    & $0.24 \pm 0.07$       & $241.2 \pm 1$    & $19.07 \pm 0.5$ & --\\
  ESO~3.6~m/Speckle  & 2008.0274   & $B'$        & $0.29 \pm 0.02$      & $237.0 \pm 3$    & $19.7  \pm 3$  & --\\
  ESO~3.6~m/Speckle  & 2008.0274   & $V'$        & $0.31 \pm 0.02$      & $236.5 \pm 3$    & $19.6  \pm 3$  & --\\
  BTA~6~m/Speckle    & 2008.0712   & $V'$        & $0.31 \pm 0.02$      & $236.2 \pm 2$    & $20.1 \pm 2$   & --\\
  VLTI/AMBER          & 2008.1479   & $H$+$K$    & $0.23 \pm 0.09$       & $234.6 \pm 1$    & $21.17 \pm 0.5$ & --\\
  VLTI/AMBER          & 2008.1726   & $H$+$K$    & $0.26 \pm 0.06$       & $236.4 \pm 1$    & $21.27 \pm 0.5$ & --\\
  \hline
\end{tabular}}
\par
\medskip
  {Notes}~--~The position angles given in Col.\ 5 are measured East of North and were corrected for the 180\degr-calibration problem described in Sect.~\ref{sec:obsspeckle}.\\
  {References}~--~(a)~\citet{wei99}, (b)~\citet{sch03a}, (c)~\citet{kra07}, (d)~\citet{pat08}.
\end{table}