Maximum intensity of (panel a) E_x, (panel b) E_y, and (panel c) E_z in the ω domain in the k_∥–k_⊥ space as shown by the color map of 20log₁₀[(E_x, E_y, E_z)/(cB₀)] over the whole simulation (0–300 ) for n_e/n₀ = 10%. “Z”, “X2”, “X3”, and “O1” stand for the Z mode, second-harmonic X mode, third-harmonic X mode, and fundamental O mode, respectively. Rectangles in panel (b) represent the areas used to calculate energies of the respective wave modes. See Fig. 2b for the obtained energy profiles.