\begin{table}%t1
\caption{Relative astrometry and photometry for \epsindiba{} and \epsindibb.
The image scale in the NACO S27 camera was measured\protect as $27.07\pm 0.05$ 
mas/pixel during NACO commissioning using astro\-metric binaries and Galactic
Centre imaging. The system position\protect angle offset was measured using images
taken of the astrometric binary WDS~19043$-$2132 on August 13 in the same
camera configuration: the error in the determination was $\pm$0.143\degree.
The separation and position angle were confirmed in independent data taken
in another NACO mode, for which the image scale was measured using both
WDS~19043$-$2132 and a non-astronomical opto-mechanical setup. The errors 
in the mean separation and position angle include the NACO data measurement 
errors and the errors in the system parameters. Differential magnitudes 
measured by Volk \etal{} (2003) and Smith \etal{} (2003) at other wavelengths 
are also given for convenience.
}
\label{tab:nacoastphot}
%\centering
\par
\begin{tabular}{cc}
\hline\hline
\multicolumn{2}{c}{Separation (arcsec)} \\ \hline
$J$   & $0.733$ \\
$H$   & $0.732$ \\
$K_{\rm s}$ & $0.731$ \\
mean  & $0.732\pm 0.002$ \\ \hline
\multicolumn{2}{c}{Position angle (\degree{} E of N)} \\ \hline
$J$   & 136.81 \\
$H$   & 136.78 \\
$K_{\rm s}$ & 136.83 \\
mean  & $136.81\pm 0.14$ \\ \hline
\multicolumn{2}{c}{$\Delta$~mag (Bb $-$ Ba) (NACO)} \\ \hline
$J$   & $0\fm94\pm0\fm02$ \\
$H$   & $1\fm76\pm0\fm02$ \\
$K_{\rm s}$ & $2\fm18\pm0\fm03$ \\ \hline
\multicolumn{2}{c}{$\Delta$~mag (Volk \etal{} 2003)} \\ \hline
$I$            & $1\fm5$ \\
1.083~\micron{} & $0\fm69$ \\
1.282~\micron{} & $0\fm47$ \\
1.556~\micron{} & $1\fm34$ \\
2.106~\micron{} & $1\fm92$ \\
2.321~\micron{} & $>$$3\fm8$ \\ \hline
\multicolumn{2}{c}{$\Delta$~mag (Smith \etal{} 2003)} \\ \hline
1.647~\micron{} & $1\fm9$ \\
2.321~\micron{} & $>$\magap{3} \\
\hline
\end{tabular}
\end{table}