ALP impact on the SDU. Black lines (top to botton): Inner border of the convective envelope, location of the H-burning shell and location of the He-burning shell, for a 7 M_⊙ (no ALPs), during the early-AGB phase; red lines (top to bottom): same as the black lines, but with g₁₀ = 0.6 and g₁₃ = 1.5. The filled circles represent the He-shell locations for the two models in Fig. 2.