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Allowed νμ → ντ neutrino oscillation parameter regions at 68 (dashed lines) and 90% (solid lines) confidence levels (CL) from various experiments. Thick-black and thick-gray lines show the allowed regions based on the zenith-angle analysis and L/E analyses in SK-I+II+III (preliminary), respectively. Also shown are the allowed regions from K2K (thin-gray lines) and MINOS (thin-black lines) long-baseline experiments.
