Unstable ℓ = 1 mode periods (Π) in terms of the effective temperature, corresponding to the pre-WD model sequence with M⋆ = 0.1868 M⊙. Color coding indicates the value of the logarithm of the e-folding time (τe) of each unstable mode (right scale). The vertical dashed lines indicate the effective temperatures of the models analyzed in Fig. 12.
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