\begin{table}%t5
\caption{\label{tab:v636cen_aps}Apsidal motion parameters for V636~Cen derived from the
photoelectric times of minima. 
}
\small%\centering
\par
\begin{tabular}{ll} 
\hline
\hline 
Parameter    & Value and rms error                    \\ 
\hline 
$i$ (\degr)                & 89.65 (assumed)             \\           
$e$                        & 0.134 (assumed)            \\
$T_0$                      & $2~447~220.8424 \pm 0.0002 $  \\
$P_{\rm anomalistic}$ (d)      & $4.283956 \pm 0.0000008$    \\ 
$P_{\rm sidereal}$    (d)      &  4.283946                   \\ 
$\omega_0$ (\degr)         & $281.95 \pm 0.06$           \\
$\omega_1$ (\degr / cycle) & $0.00080 \pm 0.00005$       \\
$U$ (yr)                   & $5270 \pm 335 $           \\
\hline
\end{tabular} 
\end{table}