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Recent progress in creation of ionized channels in gases by high intensity short laser pulses makes it possible to study a lot of new physical processes and their practical applications.Among them is the generation of extreme ultraviolet and soft X-ray radiation and,in particular,pulses of attosecond duration produced in the process of the recombination of the photoelectron with the parent ion,when it comes back in the electric field of the laser pulse [1,2].