Properties of DDI donor stars at points D (left column) and F (right column), plotted against their initial period. Panels a and b show the remaining mass relative to the total initial donor mass, panels c and d show the ratio of the period to the initial period and panels e and f show the donor star radius relative to its radius at RLOF. In all panels, the data points are coloured according to the initial mass ratio of the binary, as indicated in the legend.