\begin{table}%t2
\caption{\label{t2}Apsidal motion elements of MY~Cyg.}
%\centering
\small
\begin{tabular}{cccc}
\hline\hline
Parameter & Unit & T09 & This paper \\
\hline
$T_0$ & HJD  & --  & 2~441~585.6334 (3) \\
$P_{\rm s}$ & days & 4.005186427 & 4.00518779 (12)     \\
$P_{\rm a}$ & days & --          & 4.00521882 (12)     \\
$e$   &  --  & 0.010 (1) & 0.0094 (2)       \\
$\dot{\omega}$ & deg $\:\rm{cycle^{-1}}$ & --          & 0.0028 (3) \\
$\dot{\omega}$ & deg $\:\rm{yr^{-1}}$    & --0.21 (7)   & 0.25 (3)   \\
$\omega_0$     & deg                     & 69.6 (2.4)  & 291.7 (0.4)  \\
$U$            & years                   & 1700        & 1420 (160) \\
\hline
\end{tabular}
\end{table}