WD undergoes accretion during core He burning and shell burning phases of the donor, eventually accumulating 0.18 M_⊙ of He. The panels display the evolution of different parameters as in Fig. 2. The background colors yellow, blue, and green represent the gravitational-wave inspiral phase (GW-inspiral), H mass transfer phase (H-MT), and He mass transfer phase (He-MT), respectively. 0.7 M_⊙ WD has accreted ≈0.18 M_⊙ of material producing a ≈0.88 M_⊙ WD. For more details, see Sect. 4.3.1. This WD has the most massive He shell in our models.