Spectrum of annihilation gamma-rays from the bulge a) and the disk b). The best fit spectrum is shown (continuous black line), as decomposed in a single 511 keV positron annihilation line (dashed red), the continuum from annihilation through ortho-positronium (dashed olive), and the diffuse gamma-ray continuum emission (dashed blue). Fitted and derived parameters are given in the legends. See text for details.
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