I.E. Kuznetsova - Dr.Sc. (Phys.-Math.), Leading Researcher, Kotelnikov IRE RAS. Е-mail:kuziren@yandex.ru V.G. Mozhaev - Ph.D. (Phys.-Math.), Senior Researcher, Physics Faculty, Lomonosov Moscow State University. E-mail: vgmozhaev@mail.ru I.A. Nedospasov - Student, Physics Faculty, Lomonosov Moscow State University. Е-mail: nedospasov.ilya@physics.msu.ru