Dispersion of the plasma modes in the 2X1V simulation for v_d/c = 0.5, ω_pt_cool = 3000. Intensities in the Fourier space, (ω − k), are shown for electric, E_x, and magnetic, B_z, field components (panels (b)–(d) and (f)–(h), respectively), for different angles of propagation, θ_k = 0, π/6, π/3. The red and green dashed lines correspond to the dispersion relations of the superluminal and Alfvén modes, respectively. The white lines mark the vacuum light wave dispersion, ω = kc. For reference, panels (a) and (b) show corresponding Fourier intensities in the 1X1V simulation with the same parameters.