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We present a search for non-zero theta_{13} and deviations of sin^2theta_{23} from 0.5 in the oscillations of atmospheric neutrino data fromSuper-Kamiokande -I, -II, and -III. No distortions of the neutrino fluxconsistent with non-zero theta_{13} are found and both neutrino mass hierarchyhypotheses are in agreement with the data. The data are best fit at Delta m^2 =2.1 x 10^-3 eV^2, sin^2 theta_{13} = 0.0, and sin^2 theta_{23} =0.5. In thenormal (inverted) hierarchy theta_{13} and Delta m^2 are constrained at theone-dimensional 90% C.L. to sin^2 theta_{13} < 0.04 (0.09) and 1.9 (1.7) x10^-3 < Delta m^2 < 2.6 (2.7) x 10^-3 eV^2. The atmospheric mixing angle iswithin 0.407 <= sin^2 theta_{23} <= 0.583 at 90% C.L.

Atmospheric neutrino oscillation analysis with sub-leading effects in Super-Kamiokande I, II, and III