Evolution of the mass fraction of isotopes representative of the three s-process abundance peaks and as a function of time. These abundances were sampled at the position 0.4 M_⊙. They are representative of the entire convective zone and, after the splitting, are located in the HCZ which later comes into contact with the stellar envelope. The peaks, most noticeable for , result from episodic advance of the outer convective boundary due to limitations in the time and spatial resolution.