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Fig. 2.

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Surface temperature of HESS J1731−347 H. E. S. S. Collaboration 2011 (red cross) contrasted with the early theoretical models cooling with paired quarks (Horvath et al. 1991) with small Δ gaps, for three different initial temperatures. Refined scenarios (Grigorian et al. 2005) confirm the relatively slow cooling, instead of a large drop in , for up to ∼105 yr provided the gap is small (see text).

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