tokens: Acknowledgements Based on observations made with APEX under programme IDs O-097.F-9318, O-098.F-9305, 077.F-9310, and 079.F-9325. This work is based on observations carried out under project number 010-13 with the IRAM 30 m telescope. IRAM is supported by INSU/CNRS (France), MPG (Germany), and IGN (Spain). The Onsala 20 m telescope is operated by the Swedish National Facility for Radio Astronomy, Onsala Space Observatory at Chalmers University of Technology. L.D. acknowledges support from the ERC consolidator grant 646758 AEROSOL and the FWO Research Project grant G024112N. E.D.B. acknowledges financial support from the Swedish National Space Board. H.O. acknowledges financial support from the Swedish Research Council.
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