\begin{table}%t8
%\centering
\par
\caption{\label{tab:J2_rate}Influence of~$\dot{J}_2$ on the polynomial development of~$\psi_A$ (more particularly on the~$t^2$ and~$t^3$ terms): (1) IAU2000 (Mathews et~al.  \cite{Mathews2002}); (2) P03 (Capitaine et~al.  \cite{Capitaine2003}); and (3) Same computation as in P03 but with other~$\dot{J}_2$ values. The~$J_2$ secular trend estimation based on our~$C_{20}$ residuals series is:~$\dot{J}_2 = -2.5 \times 10^{-9}$/cy.}
\begin{tabular}{lcrr}
\hline
\hline
\noalign{\smallskip}
                & ~$\dot{J}_2$              &   ~$t^2$     & ~$t^3$       \\
\noalign{\smallskip}
\hline 
\noalign{\smallskip}
(1) IAU2000     & None                      &~$-1\farcs07259$  &~$-0\farcs001147$  \\
\noalign{\smallskip}
\hline 
\noalign{\smallskip}
(2) P03         & ~$-3 \times 10^{-9}$/cy   &~$-1\farcs079007$ &~$-0\farcs001140$  \\
\noalign{\smallskip}
\hline 
\noalign{\smallskip}
\noalign{\smallskip}
                &      & \multicolumn{2}{c}{$\overbrace{\hspace*{4.3cm}
%~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
}^{\mbox{Differences wrt P03}}$}\\
                & ~$~~~0$ /cy               &  $-7.000$ mas  &   2~$\mu$as  \\
                & ~$-2 \times 10^{-9}$/cy   &  $-2.871$ mas  &   1~$\mu$as  \\
(3)             & ~$-2.3 \times 10^{-9}$/cy &  $-1.954$ mas  &   1~$\mu$as  \\
                & ~$-2.5 \times 10^{-9}$/cy &  $-1.495$ mas  &   1~$\mu$as  \\
\hline
\end{tabular}
\end{table}