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Fig. 5.

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Upper panel: Surface gravity vs. Teff for He WD sequences with minimum MH (no residual H burning). Green symbols mark CE He WDs (P<0.1 day) (Brown et al. 2020). Bottom panel: Evolutionary time since CE ejection vs. Teff. The smooth bend at intermediate temperatures arises from H diffusion from deeper layers, which increases gravity and age.

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