Top part of each panel shows the mass of the disc to which we added the total amount of material accreted onto the star as a function of time (solid lines) categorized by the velocity of the ISM in the simulation. The colour coding is as in Fig. 3. Our theoretical estimate of the same quantity (see Sect. 4.3) is given by the dash-dotted lines in corresponding colours. The bottom part of each panel shows the total amount of material accreted onto the star in dashed lines with the corresponding colour. The dotted lines give the amount of initial disc material that is accreted onto the star. The y-scale is continuous because all quantities have the same unit.