Planetary system multiplicity distributions from the full Winter et al. (2020) sample. The left panel shows multiplicity distributions for the full reliable sample (black, “all systems”), as well as the low-density (blue, “field”), and high-density (red, “overdensities”) subsamples. The shaded blue and red dotted lines show the values corrected for the method detection bias (see the text). Error bars represent the Poissonian (﹩\sqrt{N}﹩) uncertainties on the data points. Stars show the coplanar multiplicity distribution predicted by Mulders et al. (2018, their Figure 11), scaled down by a factor of 30 to enable an easier comparison to the samples in this work. The right panel shows the same planet multiplicity distributions, but this time each sample has been normalized to the number of systems with two planets. Both panels show that the planet multiplicity distribution of systems in the “field” and “overdensities” differ considerably. While overdensities are greatly dominated by single-planet systems, the planet multiplicity distribution of stars in the field sample is significantly flatter and more closely matches the model predictions.