tokens: Acknowledgements We thank the anonymous referee for the helpful comments. With the support of the Italian Ministry of Foreign Affairs and International Cooperation, Directorate General for the Country Promotion (Bilateral Grant Agreement ZA14GR02 Mapping the Universe on the Pathway to Square Kilometre Array). AMB and ACS acknowledge support by Sonderforschungsbereich (SFB) 881 The Milky Way System (subproject A7 and A8) of the German Research Foundation (DFG).
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