Example of a binary with M_d = 0.75 M_⊙, M_a = 0.8 M_⊙, and P_i = 1.9  hours, where a He nova occurs in the WD (accretor). The panels display the evolution of different parameters as in Fig. 2. The background colors yellow, and green represent the gravitational-wave inspiral phase (GW-inspiral), and mass transfer phase during the He shell burning phase (Shell-MT), respectively. The accretor accretes with a relatively high accretion rate of ∼10⁻⁷ M_⊙ yr⁻¹, resulting in the ignition in the He layers less dense than the assumed critical density for detonation (< 10⁶ g cm⁻³).