Panel a: distribution function of separations between protostellar disks in the GGD 27 cluster. The quantity p(s) Δs is the probability that the projected separation between two randomly selected disks of the cluster is within s and s + Δs. Separations s are normalized to the cluster radius (20″) in the bottom axis, while the top axis extends up to twice this radius. The radius is determined as the distance from the average position of all the cluster members to its furthest protostellar disk. Dotted vertical lines mark the two peaks and the dip in the p(s) distribution. The right axis represents the number of pairs of stars within each separation bin Δs. Panel b: MST for the ALMA detections of the GGD 27 cluster. The positions of the cluster members are given with respect to the position of MM1 (ALMA 5) of Table A.1. MM1 and ALMA 14 are marked with colored stars. The gray cross marks the average position of the GGD 27 sources.