Tracing Hercules in Galactic azimuth with Gaia DR2 G. Monari, B. Famaey, A. Siebert, O. Bienaymé, R. Ibata, C. Wegg and O. Gerhard A&A, 632 (2019) A107 Published online: 11 December 2019 DOI: 10.1051/0004-6361/201936455