tokens: Acknowledgements The National Radio Astronomy Observatory is a facility of the National Science Foundation operated under cooperative agreement by Associated Universities, Inc. Y.W., H.B., S.B., and J.D.S. acknowledge support from the European Research Council under the Horizon 2020 Framework Program via the ERC Consolidator Grant CSF-648505, and R.S.K. via the ERC AdvancedGrant 339177 (STARLIGHT). H.B., S.C.O.G., and M.R. acknowledge support from the Deutsche Forschungsgemeinschaft in the Collaborative Research Center (SFB 881) “The Milky Way System” (subproject B1, B2, B8). R.S.K. and S.C.O.G. also acknowledge support from the DFG via Germany’s Excellence Strategy EXC-2181/1 - 390900948 (the Heidelberg STRUCTURES Cluster of Excellence). This work was carried out in part at the Jet Propulsion Laboratory which is operated for NASA by the California Institute of Technology. N.S. acknowledges support by the french ANR and the german DFG through the project “GENESIS” (ANR-16-CE92-0035-01/DFG1591/2-1). F.B. acknowledges funding from the European Union’s Horizon 2020 research and innovation program (grant agreement No 726384). This research made use of Astropy and affiliated packages, a community-developed core Python package for Astronomy ( Astropy Collaboration 2018 ), Python package SciPy 3 , APLpy, an open-source plotting package for Python ( Robitaille Bressert 2012 ), and software TOPCAT ( Taylor 2005 ). The authors thank the anonymous referee for the constructive comments that improve the paper.
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