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tokens: We thank Naomi McClure-Griffiths for providing the new H i terminal-velocity measurements from McClure-Griffiths Dickey ( 2016 ) in electronic form and the anonymous referee for a constructive report. J.B. and A.B. received financial support for this project from the Natural Sciences and Engineering Research Council of Canada. J.B. also received partial support from an Alfred P. Sloan Fellowship. T.F. and N.K. are supported by the NSF CAREER award 1455260. The MCMC analyses in this work were run using emcee (Foreman-Mackey et al. 2013 ).