Upper panel: fractional stellar mass growth of satellite galaxies in the TNG100 simulation as a function of time from their infall, for satellites selected in different stellar mass bins at |$z=0$|⁠. The solid lines and dashed areas show the mean mass growth histories and their standard deviation, respectively. Lower panel: satellites stellar mass function from the TNG100 simulation (purple dashed–dotted line), compared to that predicted by decode using the simulation’s SMHM relation in input for the frozen, star-forming, and stripped satellites models (blue solid, orange dotted, and green dashed lines, respectively), along with the logarithmic difference between decode’s and TNG’s satellite stellar mass functions.