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tokens: We thank Xiaohui Sun for providing the Urumqi 6 cm Stokes I image prior to its availability on the survey website. The paper benefitted from discussions with Jonathan Tan, Neal Evans, and Diederik Kruijssen. We thank our referee Jeff Mangum for a helpful and rapid referee report. We are grateful to the editor, Malcolm Walmsley, for additional comments and for catching many small but significant errors. E.R. is supported by a Discovery Grant from NSERC of Canada. This research has made use of the VizieR catalogue access tool, CDS, Strasbourg, France. The original description of the VizieR service was published in ( Ochsenbein et al. 2000 ). This publication makes use of molecular line data from the Boston University-FCRAO Galactic Ring Survey (GRS). The GRS is a joint project of Boston University and Five College Radio Astronomy Observatory, funded by the National Science Foundation under grants AST-9800334, AST-0098562, AST-0100793, AST-0228993, AST-0507657. This research has made use of the NASA/ IPAC Infrared Science Archive, which is operated by the Jet Propulsion Laboratory, California Institute of Technology, under contract with the National Aeronautics and Space Administration.