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Updating our previous measurements with new data and analysis modifications,we report preliminary results on the energy-dependent deficit of muon neutrinosfrom the Fermilab NuMI beam as observed with the MINOS Far Detector located 735km away in the Soudan Underground Laboratory. From an exposure of 2.50x10^20protons on target, we observe 563 charged-current nu_mu interaction candidatesin the Far Detector, where 738+/-30 events are expected in the absence ofneutrino oscillations. We have analyzed these data assuming two-flavor nu_mu tonu_tau oscillations. From a simultaneous fit to the reconstructed nu_mu energyspectra obtained during two running periods we obtain the neutrino squared-massdifference Delta m_{32}^2 = (2.38 +0.20/-0.16) x 10^-3 eV^2/c^4 with errors at68% confidence level (CL), and mixing angle sin^2(2 theta_23) > 0.84 at 90% CL.The uncertainties and confidence intervals include both statistical andsystematic errors. All results and plots presented here are preliminary.

Preliminary Results from MINOS on Muon Neutrino Disappearance Based on an Exposure of 2.5x10^20 120 GeV Protons on the NuMI Target