Radius distributions of the singles (magenta) and multis (blue), with the median radii indicated by the vertical black lines. The singles and multis in the FGK sample (panel a) have similar median radii and exhibit a dearth of planets at R ≈ 1.8–1.9 R_⊕, which appears more pronounced for the multis because they are overabundant at R ≈ 1.4–1.6 R_⊕. In the early- and late-type M samples, the singles have larger median radii than the multis.