Fig. 21
Cooling curve comparison of all the sources. In each case we show the best fit corresponding to the models: crustal cooling (MXB 1659−29), crustal cooling with small energy gap for neutron superfluidity (KS 1731−260), crustal cooling (all data fit, EXO 0748−676), crustal cooling with additional heat sources (XTE J1701−462), and crustal cooling with a high Tc (IGR J17480−2446).
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