MHD (black dashed) and PIP (red neutral, blue plasma) solutions within the shock. The figures are in the shock frame (x_s = x/t − v_s, where v_s is the propagation speed of the shock in the MHD solution). Panel a: perpendicular velocity in the shock frame v_x − v_s. Panel b: density. Green shows the total (ρ_n + ρ_p) density. Panel c: Alfvén Mach number using the plasma density (magenta) and total density (green). Panel d: Alfvén speed using the total density. Panel e: shock transitions. Panel f: pressure. Green line shows total pressure (P_n + P_p).