Probability distribution of the donor and accretor masses that is predicted to be observed in the semi-detached configuration of the Case A mass transfer phase based on the model grid. The different coloured ‘stars’ denote the position of observed semi-detached systems in the LMC (Table 1). Grey-scale: see description in Fig. 7. The red circles denote the parameters for the Galactic Algol systems (Table 2).