tokens: We thank the anonymous referee for fruitful comments. We also thank Evgenii Polyachenko for reading the manuscript and several helpful comments. The numerical simulations were performed at the Research Computing Centre (Moscow State University) and Joint Supercomputer Centre (Russian Academy of Sciences). The numerical simulation, carried out at the Research Computing Centre of Lomonosov Moscow State University, was supported by the Russian Science Foundation grant no. 14-22-00041. One of the authors (SAK) was supported by a postdoctoral fellowship sponsored by the Italian MIUR. The work was also partially supported by the President RF grant (MK-4536.2015.2) and RFBR grants (15-02-06204 and 15-32-21062).
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