Figure 1: (a) Atmospheric neutrino fluxes averaged over all directions. (b) Flux ratios (ν_{μ} + ν̄_{μ})/(ν_{e}+ν̄_{e}), ν_{μ}/ν̄_{μ} and ν_{e}/ν̄_{e}. Solid lines are for this work, dotted lines for HKKM95, dashed lines for FLUKA, and long dashed lines for BARTOL. (Figure from astro-ph/0404457).