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tokens: We acknowledge the anonymous referee for fruitful comments. We warmly thank Franck Le Petit for his assistance in the use of the PDR code. C.F. acknowledges the financial support for this work provided by the French space agency CNES along with the support from the Italian Ministry of Education, Universities and Research, project SIR (RBSI14ZRHR). We acknowledge the funding from the European Research Council (ERC), projects PALs (contract 320620) and DOC (contract 741002). This work was supported by the French program Physique et Chimie du Milieu Interstellaire (PCMI) funded by the Conseil National de la Recherche Scientifique (CNRS) and Centre National d’Etudes Spatiales (CNES) and by the Italian Ministero dell’Istruzione, Universitá e Ricerca through the grant Progetti Premiali 2012—iALMA (CUP C52I13000140001).