Neutrino cross sections and the small atmosphericνμ/νeratio

From consideration of the energy dependence of the ${\nu }_{\mathrm{\mu }}$- and ${\nu }_{\mathit{e}}$-nucleus cross sections and different choices of the momentum thresholds for ${\nu }_{\mathrm{\mu }}$- and ${\nu }_{\mathit{e}}$-induced events in underground water Cherenkov detectors, it is argued that the neutrino-nucleus cross sections currently used to calculate the expected atmospheric neutrino-induced event rates do not introduce significant error in comparing the measured and expected muon to electron event ratios.