tokens: We are grateful to Dr. J.M.D. Kruijssen and the organizers of the conference “The Multi-Scale Physics of Star Formation and Feedback during Galaxy Formation” in Heidelberg, 2018 June, for providing a collaborative atmosphere where two of the authors, B.G.E. and C.D.W., began discussing this project. We also acknowledge useful comments by the referee. C.D.W. acknowledges financial support from the Canada Council for the Arts through a Killam Research Fellowship. The research of C.D.W. is supported by grants from the Natural Sciences and Engineering Research Council of Canada and the Canada Research Chairs program. A.B. wishes to acknowledge partial support from an Ontario Trillium Scholarship (OTS). This paper makes use of the following ALMA data: ADS/JAO.ALMA#2011.0.00525.S, ADS/JAO.ALMA#2012.1.00165.S, ADS/JAO.ALMA#2013.1.00218.S, ADS/JAO.ALMA#2013.1.00379.S, ADS/JAO.ALMA#2015.1.00167.S,ADS/JAO.ALMA#2015.1.00287.S, ADS/JAO.ALMA#2015.1.00993.S, ADS/JAO.ALMA#2016.1.00140.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. The National Radio Astronomy Observatory is a facility of the National Science Foundation operated under cooperative agreement by Associated Universities, Inc. This research has made use of the NASA/IPAC Extragalactic Database (NED), which is operated by the Jet Propulsion Laboratory, California Institute of Technology, under contract with the National Aeronautics and Space Administration. Facility: ALMA. Software: astropy (Astropy Collaboration et al. 2013 ), CASA (McMullin et al. 2007 ).
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