Distributions of the parameters of high-confidence clusters, where Δt is the maximum time separation, Δυ_ɡ is the maximum velocity separation between cluster fragments, and θ is the maximum angular separation between their geocentric radiants. The dashed red lines represent the 90 th percentiles of the dataset. In the topmost subplot, the blue bars represent the 16 clusters detected by us and the purple bars represent the eight confirmed clusters; the dashed black line represents the 90 th percentile for the two sets combined.