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tokens: The Canadian Galactic Plane Survey is a Canadian project with international partners, supported by the Natural Sciences and Engineering Research Council. We thank Blakesley Burkhart and Mordecai-Mark Mac Low for useful conversations, Sean Dougherty for his encouragement through the process of completing this paper, and the referee for insightful comments that have improved this paper. C.A.H. acknowledges financial support received via an Australian Postgraduate Award, and a Vice Chancellor's Research Scholarship awarded by the University of Sydney. B.M.G. acknowledges the support of the Natural Sciences and Engineering Research Council of Canada (NSERC) through grant RGPIN-2015-05948. N.M.M.G. acknowledges the support of the Australian Research Council through grant FT150100024. E.P. acknowledges the support from the European Research Council under the European Union's Seventh Framework Programme (FP/2007–2013)/ERC Grant Agreement n. 617199. The Dunlap Institute for Astronomy and Astrophysics is funded through an endowment established by the David Dunlap family and the University of Toronto. This research made use of APLpy, an open-source plotting package for Python hosted at http://aplpy.github.com .