\begin{table}%t3
%\centering
\par
\caption{\label{tab_jie}Eigenvalues of the first and fifth modes of the $\al^2\Om$-dynamo (see Sect.~\ref{sec_aod}).} 
\begin{tabular}{cccccc}
\hline\hline \noalign{\smallskip}
& & \multicolumn{2}{c}{New method} & \multicolumn{2}{c}{Classical method} \\
\hline
$n_{\rm max}$ & $l_{\rm max}$ & $\lam_0 \; (S)$ & $\lam_4 \; (A)$ &
$\lam_0 \; (S)$ & $\lam_4 \; (A)$ \\
\hline
8 &  8 & (16.572,~0.0) & ($-$25.767,~$\pm$45.538) & (16.577,~0.0) & ($-$25.763,~$\pm$45.529) \\
12 & 12 & (16.053,~0.0) & ($-$33.126,~$\pm$39.444) & (16.053,~0.0) & ($-$33.125,~$\pm$39.443) \\
16 & 16 & (16.052,~0.0) & ($-$33.201,~$\pm$40.168) & (16.052,~0.0) & ($-$33.201,~$\pm$40.168) \\
20 & 20 & (16.053,~0.0) & ($-$33.200,~$\pm$40.157) & (16.053,~0.0) & ($-$33.200,~$\pm$40.157) \\
\hline
8 & 20 & (16.052,~0.0) & ($-$33.203,~$\pm$40.158) & (16.057,~0.0) & ($-$33.197,~$\pm$40.163) \\
12 & 20 & (16.052,~0.0) & ($-$33.200,~$\pm$40.157) & (16.052,~0.0) & ($-$33.199,~$\pm$40.157) \\
\hline
\end{tabular}
\end{table}