tokens: This paper makes use of the following ALMA data: ADS/JAO.ALMA2013.0.00458.S. ALMA is a partnership of ESO (representing its member states), NSF (USA) and NINS (Japan), together with NRC (Canada), NSC 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 data presented here were first reduced by CASA (ALMA default calibration software), but a second iteration in the data reduction and later analysis for presentation was made by using the MAPPING package available in the GILDAS software ( http://www.iram.fr/IRAMFR/GILDAS ). Also, Fig. 5 was obtained from few 30 m-IRAM telescope acquisitions and data from the APEX telescope data archive. IRAM is supported by INSU/CNRS (France), MPG (Germany) and IGN (Spain). APEX is a collaboration between the Max-Planck-Institut fur Radioastronomie, the European Southern Observatory, and the Onsala Space Observatory. This work has also been supported by the Spanish MINECO, grants AYA2016-78994-P and FIS2012-32096, and by the European Research Council (ERC) Grant 610256: NANOCOSMOS.
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