**Table 5:** Values of *FWHM*s obtained (in keV) in each ISM phase separately and in the "global'' case; the values are given for the "standard grain model'' ( $x_{\rm gr} = 1$ ), for $x_{\rm gr} = 0$ (no dust) and for $x_{\rm gr} = 10$ (overabundant and/or grain characteristics especially favorable for positron capture - see text), respectively. For the "global (combined)'' spectrum we give *FWHM* values in two cases: the McKee & Ostriker model with its phase densities and filling fractions, and the situation (results in parentheses) when the positrons are excluded from the cold phases.
$\begin{table}\begin{displaymath} \begin{array}[b]{lccc} \hline \hline \mbox{P... ...} & \quad \mbox{2.17 (1.37)} \\ \hline \end{array}\end{displaymath}\end{table}$

	1 Introduction
	2 In-flight processes
	3 Processes after thermalization
	4 Annihilation spectra
	5 Summary and conclusions
	References