\begin{table}%t1
\caption{\label{table_decay-modes}Convergence of the eigenvalues and eigenvectors  of the slowest decaying poloidal and toroidal modes$^{\rm a}$.}
%\centerline
 {\small \begin{tabular}{ccccc}
\hline \hline 
$N$ & $E(\lambda)~[A]$ & $E(\vec{B})~[A]$ & $E(\lambda)~[B]$ & $E(\vec{B})~[B]$\\
\hline
3 &1.08e-7 & 3.98e-9& 3.83e-5 & 6.849e-4\\
4 &5.651e-11 & 1.255e-12& 9.984e-8 & 4.365e-9\\
5&9.68e-14 & 2.142e-16 & 1.207e-10 & 2.497e-12\\
6 &7.72e-14 & 2.136e-20& 8.707e-14 & 9.068e-16\\
7 &1.38e-14 & 1.325e-24& 1.77e-14 & 4.80e-19\\
8 &1.90e-14 & 4.427e-29& 5.32e-15 & 6.263e-23\\
\hline
\end{tabular}}
\medskip 
$^{\rm a}$ $N$ is the number of modes in the radial basis,
and $E(\lambda) [A]$ and $E(\vec{B}) [A]$ are the errors of eigenvalue and eigenvector for the poloidal mode and $E(\lambda) [B]$ and $E(\vec{B}) [B]$ the corresponding errors for the toroidal mode.
\end{table}