Kernel density estimate for two populations from Figs. 4 and 5, both for their initial conditions (dashed lines) and retrieved disc masses at 100 kyr (solid lines). The initial mass distribution of the best-match population with (in red) is consistent with the fit by Emsenhuber et al. (2021b) to the data of Tychoniec et al. (2018), which are shown as the dashed black line, while the retrieved masses at 100 kyr are compatible with the non-multiple discs of Tobin et al. (2020).