Magnetic field strength of the shock profile. Different x-axes are shown for different quantities (from top to bottom): time in seconds from the ramp, distance in km from the ramp, distance in ion gyro-radii from the ramp, and distance in ion inertial lengths from the ramp. The vertical red line shows the position where we have defined the shock ramp and the horizontal dashed line marks the upstream magnetic field strength. Two different regions are labelled by the vertical dashed lines, and their scales are quoted in the top left corner.