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tokens: We would like to thank the referee for comments that have helped improve the paper. B.M., A.K., E.J.A., and F.B. acknowledge support from the Collaborative Research Centre 956, subproject A1, funded by the Deutsche Forschungsgemeinschaft (DFG). We would like to thank Carsten Kramer, Santiago Navarro, David John, Albrecht Sievers, and the entire IRAM Granada staff for their support during the instrument installation and observations. C.M.C. thanks the University of Texas at Austin College of Natural Sciences and NSF grants AST-1714528 and AST-1814034 for support. D.R. acknowledges support from the National Science Foundation under grant No. AST-1614213. Based on observations carried out under project Nos. 247-11, 227-12, 242-13, 117-14, and 232-15 with the IRAM 30 m telescope. IRAM is supported by INSU/CNRS (France), MPG (Germany), and IGN (Spain). This work was also supported through NSF ATI grants 1020981 and 1106284. Facility: IRAM: 30 m.