\begin{table}
\caption[]{\label{tab:v636_orb}Spectroscopic orbital elements of V636~Cen. 
}
 {
\begin{tabular}{lrrr} \hline 
\hline\noalign{\smallskip}
                            &  Primary            & Secondary           & Primary+Secondary\\
                            &                     &                     & Adopted solution\\
\hline\noalign{\smallskip}
$K_{\rm p}$ \,(\kms)              &$ 73.54 \pm 0.07$    &                     &$73.53  \pm 0.10$\\
$K_{\rm s}$ \,(\kms)              &                     &$90.48  \pm 0.25$    &$90.51  \pm 0.19$\vspace{1.0mm}\\
$\gamma$ \,(\kms)           &$-14.23 \pm 0.07$    &$-14.31 \pm 0.24$    &$-14.25  \pm 0.07$\vspace{1.0mm} \\
$e$                         &$0.1353  \pm 0.0010$ &$0.1339 \pm 0.0029$  &$0.1348 \pm 0.0012$\vspace{1.0mm}\\    
$\omega$ \,(\degr)          &$281.57 \pm 0.58$    &$281.23 \pm 1.78$    &$281.60  \pm 0.63$\vspace{1.0mm} \\
$T$-2\,400\,000$^{{a}}$ &$47223.1225\pm0.0066$&$47223.1200\pm0.0199$&$47223.1233 \pm 0.0072$\vspace{1.0mm}\\
$\sigma_{\rm p}$$^{{b}}$ \,(\kms)         & 0.33                & 	& 0.42\\
$\sigma_{\rm s}$$^{{b}}$ \,(\kms)         &	                  & 1.23	& 0.79\vspace{1.0mm}\\
\hline
\end{tabular}}

\smallskip
 $^{{a}}$  Time of periastron.
 $^{{b}}$  Standard deviation of a single radial velocity.


Note:
An orbital period of $4\fd2839423$ has been assumed (CVG08).
\end{table}