Evolution of various quantities as a function of the pulse number. Top panel: maximum temperature reached at the bottom of the pulse. The horizontal dashed line shows the temperature above which the ²²Ne(α, n)²⁵Mg reaction becomes efficient. Middle panel: third dredge up efficiency parameter λ (see text for the definition). The λ parameter for the pulses where a PIE occurs is not shown since it cannot be properly defined. Bottom panel: surface ²⁵Mg mass fraction.