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We analyze the atmospheric neutrino experiments of SuperKamiokande (535 days) using the three-flavor neutrino framework with the mass hierarchy m_1 nearly equal m_2 << m_3. We study the event ratios of sub-GeV, multi-GeV and upward through-going muons zenith angle distributions. Taking into account the atmospheric and terrestrial experiments, we obtain the allowed regions of mass and mixing parameters Δ m_12^2, sin^22θ_12, Δ m_23^2, θ_13 and θ_23. The mass parameter Δ m^2_23 is restricted todoi:10.1143/ptp.102.629 fatcat:uudpzqpjhnfxtg2kbrg4lxno6y