Zenith angle distributions observed in Super-K (240-kton · year exposure), except for 4 panels in the left (which show momentum distributions). The blue histograms show the Monte Carlo prediction without oscillations. The red histograms show the best fit expectation. Sub-GeV (multi-GeV) events are defined to have the visible energy less (greater) than 1.33 GeV. “PC stop" (“PC through") means partially contained events with at least one particle exiting from the inner detector but stopping in the outer detector.
