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The shapes of the saturated absorption resonances at transitions from the ground 1 S 0 atom state in a gas medium in the field of two unidirectional waves are investigated both analytically and numerically. It is shown for the first time that the spectra of nonlinear resonances are formed by processes in the two-and three-level V-schemes resulting from the degeneracy of the upper P transition state, are qualitatively different at the resonant transition and transitions to the more excited atomdoi:10.11648/j.ajop.20200803.11 fatcat:f3g4z5jzczgo5azcapzxiesop4