Evidence for non-axisymmetry in M 31 from wide-field kinematics of stars and gas M. Opitsch, M. H. Fabricius, R. P. Saglia, R. Bender, M. Blaña and O. Gerhard A&A, 611 (2018) A38 Published online: 20 March 2018 DOI: 10.1051/0004-6361/201730597