Multiplicity of central galaxies as a function of their stellar mass in Flagship model m3 (left) and GAEA model ECLH (right) mocks for the fiducial sample, with stellar mass weighting of the skeleton. As for connectivity, multiplicity increases with M_*, with a reversed trend at low M_*. In contrast to connectivity, the redshift-space distortions do not strongly modify the amplitude of the M_*-multiplicity relation.