HRD locations of all our models at point B (the onset of RLOF; panel a), point D (the luminosity minimum; panel b), and point F (near-complete adiabatic stratification of the envelope; panel c). In all panels, the data points are coloured according to the corresponding initial donor mass and the marker type reflects the initial mass ratio, as indicated in the legend. Panel c furthermore shows the HRD tracks of the donor stars during the 10 years preceding point F.