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tokens: We thank the anonymous referee for their insightful review. We thank E. Fomalont and J. Williams for useful discussions and suggestions during the analysis of the data. This paper makes use of the following ALMA data: ADS/JAO.ALMA.2015.1.00200.S . ALMA is a partnership of ESO (representing its member states), NSF (USA), and NINS (Japan), together with NRC (Canada) and NSC and ASIAA (Taiwan), 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 made use of astropy , a community-developed core python package for astronomy (Astropy Collaboration et al. 2013 ). This research used the facilities of the Canadian Astronomy Data Centre operated by the National Research Council of Canada with the support of the Canadian Space Agency. S.P. and L.C. acknowledge support from the Millennium Science Initiative (Chilean Ministry of Economy) through grant Nucleus RC130007. S.P. acknowledges CONICYT-Gemini grant 32130007. L.C. acknowledges support from CONICYT-FONDECYT grant 1171246. This paper used the Brelka cluster, financed by Fondequip project EQM140101. C.P. acknowledges funding from the Australian Research Council (ARC) under the Future Fellowship no. FT170100040. This work was undertaken with the SOLA (Soul of Lupus with ALMA) collaboration centered at the Joint ALMA Observatory. Facility: Atacama Large Millimeter/Submillimeter Array. Software: Common Astronomy Software Applications (McMullin et al. 2007 ), radmc-3d (Dullemond et al. 2012 ), MCFOST (Pinte et al. 2006 , 2009 ), Astropy (Astropy Collaboration et al. 2013 ).