tokens: ACKNOWLEDGEMENTS We would like to thank the referee for valuable comments. EK thanks K. É. Gabányi and S. Frey for discussions on the topic. This work was supported by the Hungarian National Research Development and Innovation Office (NKFIH) in the form of the grant 123996, and it was based upon work from the COST action CA15117 (CANTATA), supported by COST (European Cooperation in Science and Technology). This research has made use of data from the OVRO 40-m monitoring programme (Richards et al. 2011 ), which is supported in part by NASA grants NNX08AW31G, NNX11A043G and NNX14AQ89G and NSF grants AST-0808050 and AST-1109911. This research has made use of data from the MOJAVE data base, which is maintained by the MOJAVE team (Lister et al. 2009a ). The National Radio Astronomy Observatory is a facility of the National Science Foundation operated under cooperative agreement by Associated Universities, Inc.
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