K-S test p-values for the singles and multis in the FGK sample, excluding hot Jupiters, computed as a function of the maximum radius. Each consecutive test compares only the planets with radii smaller than the radius indicated on the x-axis. The multis and singles are significantly different when the planets within the region of the multis overabundance at R ≈ 1.4–1.6 R_⊕ are included in the test. Only after including larger planets do the p-values increase again above the 0.05 significance level.