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Lateral distribution of muons in extensive air showers registered at theYakutsk array was investigated. The analysis covers two periods of observation:before 2018 and after 2020, when the revision of muon detectors with 1-GeVthreshold was complete. Measured values of muon density are compared tocomputational results obtained within the framework of two hadron interactionmodels. Within the energy domain above $10^{18}$ eV the best agreement isobserved for proton composition primary cosmic rays.

Content of muons in extensive air showers measured by Yakutsk array