 In contrast, electrons, because of smaller mass, are more susceptible to scattering and almost always produce electromagnetic showers, observed by PMTs as a ring with fuzzy edges.Neutrino energy is calculated based on the direction and energy of a charged lepton produced in the CCQE interaction.In this way, and spectra are determined, leading to the measurement of the oscillation parameters relevant for muon neutrino disappearance and electron neutrino appearance.