\begin{table}%t2
\caption{Orbital elements for \object{R~Aqr}.} 
\label{table:2} 
%\centering
\par
\begin{tabular}{l c }
\hline\hline
Element             & Value \\
\hline
$P_{\rm orb}$ (day)    &   15~943 $\pm$ 471   \\
$\gamma$ (km s$^{-1}$) &   --24.9 $\pm$ 0.2     \\
$K$ (km s$^{-1}$)      &     4.0 $\pm$ 0.4     \\
$e$                    &   0.25 $\pm$ 0.07     \\
$\omega$ (deg)         &      106 $\pm$ 19     \\
$T_{0}$                & 2~444~019 $\pm$ 728 \\
$\Sigma$ (O--C)$^2$     &              40     \\
$\sigma$ (km s$^{-1}$) &            1.11     \\
\hline
\end{tabular}
\end{table}