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tokens: ACKNOWLEDGEMENTS This research was supported by the Netherlands Organization for Scientific Research (AAM), RFBR grant 18-502-12025 (GVL), the Royal Society (AI), the Väisälä Foundation (SST) in a part of development of a theoretical model and by the grant 14.W03.31.0021 of the Minestry of Educartion and Sciense of the Russian Federation (AAM and SST) in a part of data analyses and data comparison with the theoretical results. The authors would like to acknowledge networking support by the COST Actions CA16214 and CA16104. We are also grateful to Victor Doroshenko and Nikolai Shakura for discussion and a number of useful comments.