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Fig. 1


Hertzsprung-Russel (HR) diagram showing the formation and cooling of a 0.28 M helium WD (produced in an LMXB) that undergoes a hydrogen shell flash. The initial progenitor mass is 1.4 M (Z = 0.02), the neutron star mass is 1.2 M, and the initial orbital period is 5.0 days. See Table 1 for ages at each stage.

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