Time evolution of the three timescales, τ_He, τ_diff, and τ_H, for the third thermal pulse of the 1.2 M_⊙, Z = 5 × 10⁻⁵ model with poor temporal resolution (top) and the fiducial model (bottom). In the upper panel the code has missed the PIE due to poor time stepping while in the lower panel the PIE was resolved. The zero point for time in the x-axis is the point when the PDCZ first appears for this pulse.