Cumulative disc dust mass distributions for the model (left plot) using using α = 10⁻². Here we show the Pic2l (solid) and the Kom2l (dashed) photoevaporation prescriptions. A sample of observed disc masses are shown in the right plot. The two photoevaporation prescriptions are very similar at 0.5 and 1 Myr and begin to differ at the low-mass end at 2 Myr. At 4–5 Myr the Pic2l retains dust in some discs, whereas the Kom2l has very little left. We note that the 3, 4, and 5 Myr lines of the Pic2l are on top of each other. The thin coloured lines in the left plot show the gas mass multiplied by the initial dust-to-gas ratio. This shows how the disc dust mass would evolve without any radial drift. The observed sample is colour coded according to the cluster’s oldest inferred age.