a) Minimum spanning tree, as explained in Sect. 4.2, including with black, only mm sources with no IR counterpart (the most deeply embedded candidates); and with green, only mm sources with IR counterpart and classification of Class 0/I. Vertical lines at N = 18 and N = 21 guide the eye to the principle and secondary breaks, suggesting that the 18 most massive sources are more clustered than random samples of 18 sources in the map, and there is a transition before evidence for clustering disappears for lower mass sources, N ≳ 21. Horizontal line at Λ = 1 marks the regime where sources show no evidence for mass segregation. The upper x axis shows corresponding mm mass of the Nth source (considering only the embedded sources with no IR counterpart). b) Distribution of projected separations between unique pairs of millimeter sources (using Knuth binning scheme). Dark red histogram (filled) shows only mm sources with no IR counterpart, while light red (unfilled) histogram shows all sources with mm detection in our map. See Sect. 4.5 for more discussion.
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