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tokens: F.F. and A.P. are grateful to the IRAM-30 m staff for their help with the observations at the IRAM-30 m telescope. G.B. is grateful to Amanda Kepley for her help during the GBT observations and to Jeff Magnum for providing the procedures for converting the GBT spectra from GBTIDL to CLASS format. A.P. acknowledges the financial support from UNAM, and CONACyT, México. G.B. is supported by the Spanish MICINN grant AYA2008–06189–C03–01 (co-funded with FEDER funds) and by the Italian Space Agency (ASI) fellowship under contract number I/005/07/01. P.C. acknowledges the financial support of the European Research Council (ERC; project PALs 320620). A.S.-M. is supported by the Deutsche Forschungsgemeinschaft (DFG) through the collaborative research grant SFB 956 “Conditions and Impact of Star Formation”, project area A6. The research leading to these results has received funding from the European Commission Seventh Framework Programme (FP/2007-2013) under grant agreement Na 283393 (RadioNet3).