tokens: RC would like to thank Raphael Gavazzi for useful discussions. The authors would like to thank the anonymous referee, whose comments were helpful in improving the paper, and the telescope staff at the IRAM 30-m telescope for their excellent support during observations. We are also very grateful to the former director of IRAM, P. Cox, for his generous attribution of Director’s Discretionary Time early on during the program, and to Daniel Dicken for sharing telescope time. This work is based on observations carried out under projects number 082-12, D09-12, 065-13, 094-13, 223-13, 108-14, and 217-14 with the IRAM 30-m telescope. IRAM is supported by INSU/CNRS (France), MPG (Germany) and IGN (Spain). This work was supported by the Programme National Cosmology et Galaxies (PNCG) of CNRS/INSU with INP and IN2P3, co-funded by CEA and CNES. RC was supported by DFF – 4090-00079. ML acknowledges CNRS and CNES for support. CY was supported by an ESO Fellowship.
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