Number of subhalos as a function of the B/T in TNG100. The colored dots correspond to the central halos and their subhalo systems, with their color representing the central halo’s stellar mass. To demonstrate the distribution of the data for a given B/T, we use a binning scheme. The black dots and uncertainties give the mean in these bins and the lines the 1σ standard deviation. The gray line corresponds to the linear regression to all the TNG100 halos in our sample, and the gray area to the 1σ uncertainty. We show the full sample (top), the massive sample, (middle), and the light sample (bottom) as well as the corresponding sample (left), the quenched sample (middle), and the unquenched sample (right).