Power spectra at fully developed turbulence. (A) Magnetic field spectrum, (B) electron velocity spectrum, (C) ion velocity spectrum, and (D) ratio of the magnetic to electron velocity spectra at . The power laws indicated by the dash-dotted lines are given as reference. The dashed lines indicate the fitting curves obtained using the exp model. The vertical dotted lines indicate the injection scale k d_i = 4 k₀ and k d_i = 1, k d_e = 1, k ρ_i = 1, k ρ_e = 1 at .