Selection criteria used on clusters of planets. Spatial localization of clusters of planets is shown on the y-axis, as measured by the IQR of each cluster. The horizontal dashed line (at IQR = 25.2) denotes the threshold used, below which we selected clusters for being spatially localized. This corresponds to approximately the average IQR of planets in a cube the size of 1/8 the model space. Color bar shows the MC of clusters, with a high MC indicating a cluster as being important for raising the full space’s Mantel coefficient.