tokens: This research was supported by the Russian Foundation for Basic Research (grant No. 15-02-06079), by the Grants Council under the President of the Russian Federation (grant No. MK-2218.2017.2), and by the “Basis” Foundation (grant No. 17-11-101). We thank Vl. V. Kocharovsky for inspiring conversations and I. I. Artemenko for a discussion on the effect of collisions. Software: quill (Nerush Kostyukov 2010 ; Serebryakov et al. 2015 ; http://iapras.ru/english/structure/dep_330/quill.html ), ggplot2 (Wickham 2016 ; http://ggplot2.org/ ).
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