Astronomy & Astrophysics

**Table 1:** The GC 511 keV line measured by more recent high resolution spectrometers. The uncertainties quoted for the SPI results include the effects of the range of models discussed in the text (Sect. 3).
$\begin{table}{ \begin{array}[b]{lccccl} \noalign{\smallskip } \hline \hline \n... ...ce Gaussian-shape source ($FWHM$\space 30\ensuremath{^\circ} ).} \par\end{table}$