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It is shown, that primary proton spectrum, reconstructed from sea-level andunderground data on muon spectrum with the use of QGSJET 01, QGSJET II, NEXUS3.97 and SIBYLL 2.1 interaction models, demonstrates not only model-dependentintensity, but also model-dependent form. For correct reproduction of muonspectrum shape primary proton flux should have non-constant power index for allconsidered models, except SIBYLL 2.1, with break at energies around 10-15 TeVand value of exponent before break close to that obtained in ATIC-2 experiment.To validate presence of this break understanding of inclusive spectra behaviorin fragmentation region in p-air collisions should be improved, but we show,that it is impossible to do on the basis of the existing experimental data onprimary nuclei, atmospheric muon and hadron fluxes.

Shape of primary proton spectrum in multi-TeV region from data on vertical muon flux