\begin{table}%t3
%\centering
\par
\caption{Errors in the numerical propagation of the planetary
nodal rates averaged over 200 years, in \asec\   (E.M. Standish 2004,
private communication).} \label{sensi} %\centering
\par
\begin{tabular}{cccc}
\hline\hline
Mercury & Venus & Earth & Mars \\
\hline\noalign{\smallskip}
$1.82\times 10^{-4}$ & $6\times 10^{-6}$ & $2\times 10^{-6}$ & $1\times 10^{-6}$\\
\hline
\end{tabular}
\end{table}