Fig. 4.
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Common-envelope efficiency (αCE) vs. final orbital period. The solid line indicates the possible post-common envelope orbital configurations. The horizontal dashed line indicates the predicted orbital period of 95.04 minutes for PTF1 J2238+7430 (Kupfer et al. 2022), while the vertical dashed orange line marks the corresponding αCE = 0.872. The recombination energy was fixed to λ = 1.
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