As Fig. 6, except tracers are now binned by distance from the median shock position, rather than time since injection. Distance bins are equal to the time bins in Fig. 6 multiplied by the relevant post-shock velocity (approximately 440 and 500 km/s for Mach 2 and Mach 3 shocks, respectively). Contributions binned by distance do not match those binned by time since injection due to the highly non-laminar flow. This can also be seen in the strongly overlapping distributions of time since injection within each distance bin (bottom row).