\begin{table}%t6
%\centering
\par
\caption{Best-fit parameters with formal errors for the binary model.}
%\vspace{2ex}
\begin{tabular}{lll}
\hline
\hline
                    & This work ($K$ band)   & {\it Hipparcos} ($V$ band) \\
\hline
$\rho$              & $212.7 \pm 1.5$ mas  & $255 \pm 39$ mas   \\
$\theta$            & $157.6 \pm 1.7$ deg  & 198 deg            \\
$r$                 & $50.1 \pm 5.6$       & $21.5 \pm 5.9$     \\
$\Delta m$          & $4.25 \pm 0.12$      & $3.33 \pm 0.31$    \\
$\phi_1$            & $21.56 \pm 0.05$ mas &                    \\
$\phi_2$            & 0 (fixed)            &                    \\
$\chi^2_{\rm r}$ & $2.6$                &                    \\
\hline
\end{tabular}
\label{tab:binary}
\end{table}