Kippenhahn diagrams showing the PIE in a 1 M_⊙, [Fe/H] = −2.5 AGB model for three different values of the overshoot coefficient at the top of the convective pulse (f_top). Convective regions are shaded gray. The dotted green and blue lines trace the mass coordinate where the nuclear energy production by hydrogen and helium burning is maximum, respectively. The dashed green and blue lines delineate the hydrogen and helium-burning zones (where the nuclear energy production by H and He burning exceeds 10 erg g⁻¹ s⁻¹). The red areas show the extent of the overshoot zones. The black crosses indicates where and when the convective pulse splits.