Comparison of the energy evolution of electric field components parallel, E_x, and perpendicular, E_y, to the magnetic field between 1D (black lines) and 2D (blue lines) simulations. All energies are normalized to the initial kinetic energy. The parallel components of the energy ratio W_x/W_k are always smaller in 2D than in 1D and decreasing. The 2D simulations grow later because they contain a lower initial noise level than the 1D ones at the simulation start. (a) S1–1D + S1–2D. (b) S2–1D + S2–2D. (c) S3–1D + S3–2D.