PDFs of the multiplicity of central galaxies for an Hα-limited selection of galaxies in the fiducial sample (𝒟_noise, 60%; coloured lines) for Flagship model m3 (left) and GAEA model ECLH (right) mocks, with stellar mass weighting of the skeleton. The full sample without noise (𝒟) is shown for a comparison (grey lines). In each panel, vertical lines indicate the medians of distributions and error bars correspond to the standard deviation across five mocks. The mean and median values for all distributions are reported in Tables B.3 and B.4. The multiplicity of the cosmic web shows only a weak sensitivity to the FoG effect, redshift error, and sample completeness.