tokens: Acknowledgments We thank the anonymous referee for their constructive comments. AC (ORCID 0000-0003-4578-514X) acknowledges support from the UK Science and Technology Facilities Council (STFC) consolidated grant ST/L000652/1. MTS acknowledges support from a Royal Society Leverhulme Trust Senior Research Fellowship (LT150041). We acknowledge financial support from the Swiss National Science Foundation (AC, project PBEZP2_137312), from the Agence Nationale de la Recherche (AC and ElF, contract no. ANR- 12-JS05-0008-01) and from the E. C. through an ERC grant (AC and FB, StG-257720). GEM acknowledges support from the ERC Consolidator Grant funding scheme (project ConTExt, grant no. 648179) and a research grant (13160) from Villum Fonden. WR is supported by a CUniverse Grant (CUAASC) from Chulalongkorn University and JSPS KAKENHI grant no. JP15K17604. This paper makes use of the following ALMA data: ADS/JAO.ALMA#2013.1.01271.S. ALMA is a partnership of European Southern Obseratory (ESO, representing its member states), NSF (USA) and NINS (Japan), together with NRC (Canada), NSC and ASIAA (Taiwan), and KASI (Republic of Korea), in cooperation with the Republic of Chile. The Joint ALMA Observatory is operated by ESO, AUI/NRAO and NAOJ. The research leading to these results has received funding from the European Commission Seventh Framework Programme (FP/2007-2013) under grant agreement no. 283393 (RadioNet3).
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