Occurrences in the randomized sample of positions relative to an integrated surface density Σ > Σthr,x. The dashed vertical line is for 3σ. Left, CO: there are 19 sources in the GPS above the threshold that correspond to 3.9σ (solid vertical line). Middle, Dust: there are 16 in the GPS above the threshold that correspond to 3.1σ (solid vertical line). Right: occurrences in randomized sample where surface density estimates from both tracers are above the respective threshold. There are 15 in the GPS that simultaneously satisfy the two thresholds, and this corresponds to 3.5σ.
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