tokens: We are grateful to Ivan Marti-Vidal and the Nordic ALMA Regional Center for providing us with helpful CASA software tools and advice on analyzing the data. We appreciate Tohru Nagao, Jeremy Blaizot, Peter Mitchell, Takashi Kojima, Shiro Mukae, Yuichi Harikane, Akio Inoue, and Rieko Momose for useful comments and suggestions. We are indebted for the support of the staff at the ALMA Regional Center. This paper makes use of the following ALMA data: ADS/JAO, ALMA #2013.1.00815.S, #2015.1.00834.S, #2015.1.01111.S, #2015.1.01105, #2016.1.01240.S, #2012.1.00523.S, and #2012.1.00602.S. ALMA is a partnership of the 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 the ESO, AUI/NRAO, and NAOJ. This study is supported by World Premier International Research Center Initiative (WPI Initiative), MEXT, Japan, and KAKENHI (15H02064, 16J02344, 17H01110, 17H01111, and 17H01114) Grant-in-Aid for Scientific Research (A) through the Japan Society for the Promotion of Science (JSPS), the Grant-in-Aid for JSPS Research Fellow, the NAOJ ALMA Scientific Research grant No. 2017-06B, and the Munich Institute for Astro- and Particle Physics (MIAPP) of the DFG cluster of excellence “Origin and Structure of the Universe.” S.F. is supported by the ALMA Japan Research Grant of NAOJ Chile Observatory NAOJ-ALMA-197, The 2018 Graduate Research Abroad in Science Program Grant (GRASP2018), and the Hayakawa Satio Fund awarded by the Astronomical Society of Japan. A.F. and R.J.I. acknowledge support from the ERC Advanced Grant INTERSTELLAR H2020/740120 and COSMIC ISM 321302, respectively.
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