\begin{table}%t3
\caption{Integrated radio flux densities.\label{table:globalspix}}
%\centering
                                                                            \begin{tabular}{ccccc}
\hline\hline
$\lambda$  &$S_{\rm SNR}$  & $S_{\rm PWN}$ & 
$S_{\rm PWN}^{\rm corr}$& $S_{\rm shell}$ \\
(cm) &(Jy)  & (Jy)&(Jy)&(Jy)  \\
\hline
3.6  & &1.57~$\pm$~0.40& 1.35~$\pm$~0.50&  \\
6  & $\geq$$6.90\pm 0.20$& $3.20\pm0.14$& 
1.45~$\pm$~0.23& $\geq$3.70~$\pm$~0.25 \\
20  & 11.50~$\pm$~0.70& 3.23~$\pm$~0.20  &1.72~$\pm$~0.30&  8.27~$\pm$~0.70 \\
\hline
\end{tabular}
\end{table}