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tokens: We thank the anonymous referee for useful comments. F.L. thanks Sean Andrews for discussions on comparing ALMA fluxes to past interferometer fluxes, and Zhaohuan Zhu, Kaitlin Kratter, and Andrew Youdin for insightful discussions. F.L. and G.J.H. thank Subo Dong for discussions of planet mass functions and radial distributions. F.L. and G.J.H. are supported by general grants 11473005 and 11773002 awarded by the National Science Foundation of China. P.P. acknowledges support by NASA through Hubble Fellowship grant HST-HF2-51380.001-A awarded by the Space Telescope Science Institute, which is operated by the Association of Universities for Research in Astronomy, Inc., for NASA, under contract NAS 5-26555. G.D. acknowledges financial support from the European Research Council (ERC) under the European Union’s Horizon 2020 research and innovation program (grant agreement no. 681601). D.H. is supported by European Union A-ERC grant 291141 CHEMPLAN, NWO, and by a KNAW professor prize awarded to E. van Dishoeck. C.F.M. acknowledges support through the ESO Fellowship. M.T. has been supported by the DISCSIM project, grant agreement 341137 funded by the European Research Council under ERC-2013-ADG. F.M., G.v.d.P., and Y.B. acknowledge funding from ANR of France under contract no. ANR-16-CE31-0013 (Planet-Forming-Disks). D.J. is supported by NRC Canada and by an NSERC Discovery Grant. B.N. and G.L. thank the support by the project PRIN-INAF 2016 The Cradle of Life—GENESIS-SKA (General Conditions in Early Planetary Systems for the rise of life with SKA). Y.L. acknowledges support by the Natural Science Foundation of Jiangsu Province of China (grant no. BK20181513) and by the Natural Science Foundation of China (grant no. 11503087). This paper makes use of the following ALMA data: 2016.1.01164.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. This work has made use of data from the European Space Agency (ESA) mission Gaia ( https://www.cosmos.esa.int/gaia ), processed by the Gaia Data Processing and Analysis Consortium (DPAC, https://www.cosmos.esa.int/web/gaia/dpac/consortium ). Funding for the DPAC has been provided by national institutions, in particular the institutions participating in the Gaia Multilateral Agreement. Software: Galario (Tazzari et al. 2018 ), emcee (Foreman-Mackey et al. 2013 ), RADMC-3D (Dullemond et al. 2012 ), CASA (v5.1.1; McMullin et al. 2007 ).