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tokens: We are grateful to the anonymous referee for constructive comments that helped us improve the manuscript. We thank Luis Colina, Alvaro Labiano, Leonard Burtscher and Daniel Asmus for useful discussions. A.A.-H. and I.G.-B. acknowledge support from the Spanish Ministry of Science, Innovation and Universities through grant AYA2015-64346-C2-1-P, which was party funded by the FEDER program. A.A.-H. also acknowledges CSIC grant PIE201650E36. A.A.-H., S.G.-B. and A.U. acknowledge support from the Spanish Ministry of Science, Innovation and Universities through grant PGC2018-094671-B-I00, which was party funded by the FEDER program. S.G.-B. and C.R.A. acknowledge the Spanish Plan Nacional de Astronomía y Astrofísica under grant AYA2016-76682-C3-2-P. M.P.-S. and D.R. acknowledge support from STFC through grant ST/N000919/1. T.D.-S. acknowledges support from ALMA-CONICYT project 31130005 and FONDECYT regular project 1151239. S.F.H. is supported by European Research Council Starting Grant ERC-StG-677117 DUST-IN-THE-WIND. C.R.A. also acknowledges the Ramón y Cajal Program of the Spanish Ministry of Science and Technology through project RYC-2014-15779. S.R. and M.V. gratefully acknowledge support from the Independent Research Fund Denmark via grant numbers DFF 4002-00275 and 8021-00130. L.K.H. acknowledges funding from the INAF PRIN-SKA 2017 program 1.05.01.88.04. C.R. acknowledges support from the CONICYT+PAI Convocatoria Nacional subvencion a instalacion en la academia convocatoria año 2017 PAI77170080. D.R. acknowledges the support of the Science and Technology Facilities Council (STFC) through grant ST/P000541/1. AU acknowledges support from the Spanish MINECO grants ESP2015-68964 and AYA2016-79006. This paper makes use of the following ALMA data: ADS/JAO.ALMA.2016.1.00254.S and JAO.ALMA.2016.1.01236.S. ALMA is a partnership of ESO (representing its member states), NSF (USA) and NINS (Japan), together with NRC (Canada), MOST 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. Based on observations made with the NASA/ESA Hubble Space Telescope, obtained from the data archive at the Space Telescope Science Institute. STScI is operated by the Association of Universities for Research in Astronomy, Inc. under NASA contract NAS 5-26555.