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tokens: We thank the referee, D. C. Gabuzda, for a thorough reading of the manuscript and for many suggestions that improved the paper. We are grateful to D. E. Homan and S. Kiehlmann for reading the manuscript and making useful suggestions, and to the entire MOJAVE team for their years of work in assembling the data used here. This research has made use of data from the MOJAVE database that is maintained by the MOJAVE team (Lister et al. 2009 ); the MOJAVE program is supported under NASA-Fermi grant NNX15AU76G. Operations at UMRAO were supported by the University of Michigan, and research there was funded in part by NASA-Fermi GI grants NNX09AU16G, NNX10AP16G, NNX11AO13G, and NNX13AP18G and NSF grant AST-0607523. Y.Y.K. and A.B.P. were supported by the Russian Foundation for Basic Research (project 17-02-00197), the Basic Research Program P-28 of the Presidium of the Russian Academy of Sciences, and the government of the Russian Federation (agreement 05.Y09.21.0018). T.S. was funded by the Academy of Finland projects 274477 and 284495. This research has been supported in part by the Alexander von Humboldt Foundation, and it has made use of the Swinburne University of Technology software correlator, developed as part of the Australian Major National Research Facilities Programme and operated under license (Deller et al. 2007 ).