\begin{table}%t3
\caption{Parameters of the best orbital solution for Sa -- Sb.}
\label{OrbSabTab}
%{1.1}
%\centering
$$
\begin{tabular}{lcr@{}l}
\hline \hline
Orbital element				&  & \multicolumn{2}{c}{Value} \\
\hline
%&&& \\[-8pt]
Date of periastron $T_0$			&  & $2~451~091$ & $~^{+ 250}_{-1200}$\\
						&  & (1998 Oct.  4)\span\\
Period $P$ (years)				&  & $     93$ & $~^{+ 115}_{  -55}$\\
Semi-major axis $a$ (mas)			&  & $    201$ & $~^{+ 430}_{ -110}$\\
Semi-major axis $a$ (AU)			&  & $     30$ & $~^{+  63}_{  -16}$\\
Eccentricity $e$				&  & $   0.57$ & $~^{+0.20}_{-0.22}$\\
Argument of periastron $\omega$ ($^\circ$)	&  & $  300.6$ & $~^{+12.0}_{-30.0}$\\
PA of ascending node $\Omega$ ($^\circ$)	&  & $  283.2$ & $~^{+ 4.0}_{ -7.0}$\strut\\
Inclination $i$ ($^\circ$)			&  & $   55.1$ & $~^{+ 2.0}_{-20.0}$\\
System mass $M_{\rm S}$ ($M_\odot$)			&  & $   2.96$ & $~^{+0.15}_{-0.24}$\\
reduced $\chi^2$				&  & $    3.8$\\
\hline
Mass ratio $M_{\rm Sb}/M_{\rm Sa}$		&  & $   0.39$ & $~\pm 0.06$\\
Mass of Sa $M_{\rm Sa}$ ($M_\odot$)		&  & $   2.13$ & $~^{+0.14}_{-0.20}$\\
Mass of Sb $M_{\rm Sb}$ ($M_\odot$)		&  & $   0.83$ & $~^{+0.10}_{-0.11}$\\
&&& \\[-8pt]
\hline
\end{tabular}
$$
\end{table}