\begin{table}%t3
 \caption{\label{T3}Fundamental frequencies for the orbital solution in
 Table~\ref{T2}.} 
%\centerline
 {\small \begin{tabular}{crr}
 \hline\hline
      & Frequency   & Period \\
      & $^\circ/yr$ & yr \\
 \hline
 $n_{\rm b}$ & 576.429624 & 0.624534 \\
 $n_{\rm c}$ & 384.033313 & 0.937419 \\
 $g_1$ &         $-$0.759309 &  474.115 \\
 $g_2$ &            0.110472 &  3258.74 \\
 $l_\theta$     &  19.820696 &   18.1628 \\
 \hline
\end{tabular}}
\medskip
$n_{\rm b}$ and $n_{\rm c}$ are the mean motions, $g_1$ and $g_2$ are the  secular frequencies of the periastrons, and $l_\theta$ is the libration  frequency of the resonant angle $\theta_{\rm b} = 2 \lambda_{\rm b} - 3 \lambda_{\rm c} +  \omega_{\rm b} $. Indeed, we have $ 2 n_{\rm b} - 3 n_{\rm c} + g_1 = 0 $.
\end{table}