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Zenith angle distributions observed in SK-I+II+III during 2,806 days of the detector exposure (173 kilo-ton · year). Sub- and multi-GeV fully-contained events are defined to have the visible energy below and above 1.33 GeV, respectively. In the right most panel, PC events are added to the multi-GeV μ-like events. The dotted and solid histograms show the un-oscillated and best-fit oscillated Monte Carlo distributions, respectively.
