Maximum false positive heat map for bins of semi-major axis (au) by inclination (deg). The heat map coloration represents the mean number of pairs plus 3σ that have D_H < 0.1. The sporadic orbital distribution was estimated using the 616 possible 1 g fall observations PDF (Fig. 4). The means and standard deviations were calculated through 500 iterations of KDE sampling. Subplot a examines the maximum number of expected random associations within a population of 616 fireballs, only one (red) in the observations has a measured D_H < 0.1, but it is not statistically significant. Subplot b re-examines the significance of the Príbram-Neuschwanstein pair (black square); however, the pair is still not statistically significant within a fireball population of 481 orbits.