Hic sunt dracones: Cartography of the Milky Way spiral arms and bar resonances with Gaia Data Release 2S. Khoperskov, O. Gerhard, P. Di Matteo, M. Haywood, D. Katz, S. Khrapov, A. Khoperskov and M. ArnaboldiA&A, 634 (2020) L8DOI: https://doi.org/10.1051/0004-6361/201936645