Fig. 4.
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Orbital period (Porb) just after the CE evolution as a function of the fraction of the thermodynamic internal energy (αint) used to calculate the CE binding energy (Eq. (2)), assuming αCE = 0.3. The horizontal line indicates the initial post-CE orbital period that is required to explain FN Sgr, which is obtained by assuming αint ≈ 0.82.
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