Representative example of binary evolution calculations, where the binary system is in the weak H-shell flash phase at the moment of the SN explosion. In panel a), the solid, dashed, and dashed-dotted curves present Ṁ₂, Ṁ_CO, and M_WD, varying with time. In panel b), the evolutionary track of the donor in the Hertzsprung-Russell diagram is shown as a solid curve, and the evolution of orbital period is shown as a dashed-dotted curve. Dotted vertical lines in both panels indicate the position where the WD produces an SN Ia.