Gamma-ray spectroscopy of positron annihilation in the Milky Way Thomas Siegert, Roland Diehl, Gerasim Khachatryan, Martin G. H. Krause, Fabrizia Guglielmetti, Jochen Greiner, Andrew W. Strong and Xiaoling Zhang A&A, 586 (2016) A84 Published online: 28 January 2016 DOI: 10.1051/0004-6361/201527510