Gaia kinematics reveal a complex lopsided and twisted Galactic disc warp M. Romero-Gómez, C. Mateu, L. Aguilar, F. Figueras and A. Castro-Ginard A&A, 627 (2019) A150 Published online: 16 July 2019 DOI: 10.1051/0004-6361/201834908