Power spectra of the velocity v ² _k (thick solid), magnetic field B ² _k /4π (dashed), and (dotted). The top panel shows the spectra in the region x ∈ [0.75, 1.25] and y ∈ [1.3, 1.8] of Model 1 at t = 1425 yr, and the bottom panel shows those in the region x ∈ [1.3, 1.8] and y ∈ [0.75, 1.25] of Model 2 at t = 1508 yr. The thin solid lines show Kolmogorov spectra v ² _k ∝ k ^{−(5/3)−( D−1)} at D = 2. The ratio of B ² _k /4π to indicates the ratio of the magnetic to kinetic energies at scale k.