Period spacing diagrams showing dipole g modes, for both the accretor model (orange line) and the single-star model (blue line). The horizontal lines mark the asymptotic value of the period spacing. We show results for only four different evolutionary stages, X_c= 0.7, 0.5, 0.3, and 0.1. The bottom panel shows the comparison of the ℓ=1 asymptotic period spacing evolution between the accretor and the single model. We mark points corresponding to key evolutionary changes of the accretor according to Figure 1.