Comparison between the proper motions of our injected clusters and clusters in HR24 as a function of galactocentric radius. All 192 318 simulated clusters are shown by the heatmap, with a colour bar on the right. The proper motion distribution of the 818 HR24 clusters within our studied region is shown by the kernel density estimate, with contours at the 0.1%, 20%, 50%, and 80% density levels.