\begin{table}%t1
\caption{\label{tab_26Alringmass}Galactic mass distribution of $^{26}$Al obtained from our analysis of 4 years of INTEGRAL/SPI observations (see text).}
%\centering
\par
\begin{tabular}{lr}
\hline\hline
 ring 1 (0--3~kpc) &  0.17 $\pm$ 0.07~$M_{\odot}$\\
\celltspace \cellbspace ring 2 (3--6~kpc) &  1.18 $\pm$ 0.15~$M_{\odot}$\\
\celltspace \cellbspace ring 3 (6--8~kpc) &  0.18 $\pm$ 0.08~$M_{\odot}$\\
\celltspace \cellbspace ring 4 (8--9~kpc) &  0.15 $\pm$ 0.04~$M_{\odot}$\\
\celltspace \cellbspace ring 5 (9--12~kpc) &  --0.28 $\pm$ 0.18~$M_{\odot}$\\
\celltspace  Total $^{26}$Al mass &  1.68 $\pm$ 0.19~$M_{\odot}$\\
\hline
\end{tabular}
\end{table}