\begin{table}%t3
\caption{\label{tab:rm}Polarized intensity weighted mean values of the rotation measure distribution in~rad/m$^2$.}
\small
%\centering
\par
\begin{tabular}{l c c c c c c c}        
\hline\hline \noalign{\smallskip}                
 & N4321 & N4396 & N4501 & N4535 & N4654 \\    
\hline                        
$\langle \rm RM\rangle$ & $-$5 & $-$7 & +10 & 2 & $-$8/2 \\
\hline                                  
\end{tabular}
\end{table}