Toroidal (E_ϕ, solid), radial (E_R, dashed), and vertical (E_z, dotted–dashed) magnetic energies (volume averaged in cylindrical annuli described in the main text) for the magnetized calculations at two initial field strengths, B₀ ≃ 1 kG (blue) and B₀ ≃ 1 μG (orange). For the kilogauss run, we present two linear resolutions, Δx ≃ 175 km (bold) and Δx ≃ 350 km (fine). We overplot the growth rate expected for the most unstable MRI wavelength, γ_max (black dotted).