\begin{table}%t2
\caption{\label{tab_orb}\label{tab2}Orbital parameters of $\gamma^1$~Leonis.}
\small%\centering
\par
\begin{tabular}{cc}
\hline \hline
Period (days)              & 428.5     $\pm$ 1.25  \\
$K$ ($\rm m~s^{-1}$)      & 208.3     $\pm$ 4.3   \\
$e$                          & 0.144     $\pm$ 0.046 \\
$T_{\rm periastron}$           & 2~451~236   $\pm$ 13.5  \\
$\omega$ (deg)             & 206.7     $\pm$ 9.2   \\
rms ($\rm m~s^{-1}$)                 & 43                    \\
reduced $\chi^2$           & 48                    \\
$m \sin i$ $(M_{\rm Jupiter})$ & 8.78      $\pm$ 1.0   \\
$a$ (AU)                   & 1.19      $\pm$ 0.02  \\
\hline
\end{tabular} 
\end{table}