Structure of the reference shock with M_s = 3, β = 20, and θ_Bn = 75° (run A4) at different times Ω_cit = 10 (panels a^*), Ω_cit = 30 (panels b^*), and Ω_cit = 55 (panels c^*). From top to bottom, shown are the maps of the normalized ion density, N_i/N_0i (panels ^*1), and the normalized magnetic field fluctuations (see Eqs. (8)–(10)), δB_x (panels ^*2), δB_y (panels ^*3), and δB_z (panels ^*4). The scaling of all distributions is logarithmic and for the magnetic fields it is sign-preserving, and, e.g., for δB_z it is: sgn(δB_z)⋅{2 + log[max(|δB_z|/B₀, 10⁻²)]}. The level of “0” on the color scale hence corresponds to |δB|/B₀ ≤ 10⁻² (see, e.g., Kobzar et al. 2021).