Comparison of the time evolution of λ_m (top) and λ_acc (bottom) between the viscous+photoevaporative and wind-driven case including measured slopes from four star-forming regions. To account for statistical fluctuations, each simulation combines 100 realisations of the same initial conditions: the lines show the median evolution, while the shaded area represent the interval between the 25th and 75th percentiles. The simulations in the three columns differ for the initial number of discs, determined to obtain a specific sample size at 5 Myr − currently available sample (left), double the currently available sample (centre) and the complete sample (right). Observed slopes from Testi et al. (2022).