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tokens: We thank the Herschel /WISH team (PI: E.F. van Dishoeck), which hosted a team meeting at which this proposal idea was initially generated. We are grateful to Adam Kraus and Subo Dong for helpful discussions. F.L. and G.J.H. are supported by general grant Nos. 11773002 and 11473005 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 No. NAS 5-26555. D.H. is supported by the 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 and partially supported by the Deutsche Forschungs-Gemeinschaft (DFG, German Research Foundation)—Ref. No. FOR 2634/1 TE 1024/1-1. M.T. has been supported by the DISCSIM project, grant agreement No. 341137 funded by the European Research Council under ERC-2013-ADG and by the UK Science and Technology Research Council (STFC). F.M., G.v.d.P, and Y.B. acknowledge funding from the 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 of the project PRIN-INAF 2016 The Cradle of Life—GENESIS-SKA (General Conditions in Early Planetary Systems for the rise of life with SKA). C.F.M., G.L., and M.T. have received funding from the European Union’s Horizon 2020 research and innovation programme under the Marie Sklodowska-Curie grant agreement No. 823823 (DUSTBUSTERS). Y.L. acknowledges supports by the Natural Science Foundation of Jiangsu Province of China (grant No. BK20181513) and by the Natural Science Foundation of China (grant No. 11503087). G.D. and E.R. acknowledge financial support from the European Research Council (ERC) under the European Union’s Horizon 2020 research and innovation programme (grant agreement No. 681601). N.H. thanks the LSSTC Data Science Fellowship Program, which is funded by LSSTC, NSF Cybertraining grant 1829740, the Brinson Foundation, and the Moore Foundation; his participation in the program has benefited this work. This paper makes use of the following ALMA data: 2016.1.01164.S. ALMA is a partnership of ESO (representing its member states), the US National Science Foundation (NSF), 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. This work used the Immersion Grating Infrared Spectrometer (IGRINS) that was developed under a collaboration between the University of Texas at Austin and the Korea Astronomy and Space Science Institute (KASI) with the financial support of the US NSF under grant No. AST-1229522, of the University of Texas at Austin, and of the Korean GMT Project of KASI. These results made use of the Discovery Channel Telescope at Lowell Observatory. Lowell is a private, nonprofit institution dedicated to astrophysical research and public appreciation of astronomy and operates the DCT in partnership with Boston University, the University of Maryland, the University of Toledo, Northern Arizona University, and Yale University. Software: Galario (Tazzari et al. 2018 ), emcee (Foreman-Mackey et al. 2013 ), CASA (v4.7.2, v5.1.1; McMullin et al. 2007 ).