Run A. Energy spectra averaged during time interval 10 ≤ t ≤ 12. Wavenumbers are normalized by the dissipative wavenumber k_d for which k²E^M(k) is maximum; see text. a) From top to bottom: total, residual, magnetic, and kinetic energies, compensated resp. by k^{− 5/3}, k^-2, k^{− 5/3}, k^{− 3/2}. Spectra are arbitrarily shifted vertically. b) Normalized residual energy : (i) (solid) normalized by the α = 1 model (Eq. (7)); (ii) (dotted) normalized by the α = 2 model; (iii) (dashed) by the α = 1 model with the nonlinear time given by the advection time (see text).