Evolution of the effective ¹³C pocket in the 3, 4, and 5 M_⊙ stars for the overshoot parameters ω = 0.10, 0.12, and 0.14. The y axis shows the mass fraction of effective ¹³C as defined in Eq. (1), while the x axis shows the width of the pockets in solar masses, with each pocket representing the widest mass extent of the effective ¹³C pocket in each inter-pulse. This occurs once the protons have burned completely in the He intershell but before the ¹³C starts to burn. The pockets are artificially arranged, with the earliest inter-pulse to the left to the latest on the right, to show the temporal evolution of their shape and size. There is not a one-to-one correspondence of the number of ¹³C pockets presented here and the number of TP shown in Fig. 4. This is because a higher ω forces a higher TDU efficiency, forming more ¹³C pockets.