tokens: We thank S. Guilloteau and S. Bardeau for their help on the GILDAS software and J. M. Winters for helpful comments. This paper makes use of data from the following instruments: The Submillimeter Array (SMA project number 2011B-S052, 2012B-S004, and 2012B-S101), IRAM single dish telescope and interferometer (projects t020, v018), ALMA (ADS/JAO.ALMA#2013.1.01215.S). The work was partly supported by the CNRS program “Physique et Chimie du Milieu Interstellaire” (PCMI). M.G. also acknowledges support for travel by the SMA. We thank Spanish MICINN for funding support through grants AYA2006-14876, AYA2009-07304 and the CONSOLIDER program “ASTROMOL” CSD2009-00038, and the European Research Counil for funding support through the European Union’s Seventh Framework Program (FP/2007-2013)/ ERC Grant Agreement No. 610256 NANOCOSMOS.
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