tokens: We thank the anonymous referee for her/his helpful and thorough reading of the manuscript, as well as for suggestions that improved the paper. B.G., E.A.C., and I.R.S. acknowledge support from the ERC Advanced Programme DUSTYGAL (321334) and STFC (ST/P0000541/1). I.R.S. also acknowledges support from a Royal Society Wolfson Merit Award. J.L.W. acknowledges support from a European Union COFUND/Durham Junior Research Fellowship (EU grant agreement number 609412) and from STFC (via an Ernest Rutherford Fellowship: ST/P004784/1, and additionally ST/P0000541/1) E.I. acknowledges partial support from FONDECYT through grant N° 1171710. This paper makes use of the following ALMA data: ADS/JAO.ALMA#2015.1.00456.S ALMA is a partnership of ESO (representing its member states), NSF (USA), and NINS (Japan), together with NRC (Canada), MOST and ASIAA (Taiwan), as well as KASI (Republic of Korea), in cooperation with the Republic of Chile. The Joint ALMA Observatory is operated by ESO, AUI/NRAO, and NAOJ.
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