Spatial distribution of | v_xn/Cs_n | and | v_xp/V_A | for a c-shock (β = 0.3 and ξ_i = 0.01) in panel a), a weak j-shock (β = 0.1 and ξ_i = 0.01) in panel b), and a j-shock (β = 0.01 and ξ_i = 0.01) in panel c) around the shock front (calculated in the shock frame). The x-axis is shifted by x_s, where x_s is taken as the point in the shock where the drift velocity is at its peak, so that all distributions are aligned.