Comparison of Solar Orbiter shock profiles. This figure compares the high Mach number shock profile with other interplanetary shocks captured by Solar Orbiter. For both panels the high Mach number shock profile is indicated by the black curve, whereas the other shock profiles are in grey. The quantity plotted is the magnetic field strength normalised by the upstream value. Panel (a) includes shocks when θ_bn > 45°, whereas panel (b) only shows θ_bn > 80°. The horizontal dashed line in both panels indicates four, which is the maximum compression across the shock front according to the Rankine–Hugoniot relations.