Change of volume-averaged magnetic energy in the r, θ and ϕ components of the magnetic field normalized to the initial magnetic energy in a shell from r_out/40 to r_out as a function of time in model H1. In this model, the magnetic field is amplified by the MRI. The growth of each component of the magnetic field is defined as δB²_r,θ,ϕ = (〈B²_r,θ,ϕ〉_V−B²_r,θ,ϕ,0), where 〈〉_V denotes volume average and B₀ is the initial field strength.