Constraints on positron annihilation kinematics in the inner Galaxy Thomas Siegert, Roland M. Crocker, Roland Diehl, Martin G. H. Krause, Fiona H. Panther, Moritz M. M. Pleintinger and Christoph Weinberger A&A, 627 (2019) A126 Published online: 11 July 2019 DOI: 10.1051/0004-6361/201833856