Fig. 12
Spin period derivative, Ṗ-12, vs. m for a NS radius of 10 km (red curve); the black curves represent the upper and lower limit values of the spin derivative. The grey box indicates the mass range allowed for X1822-371 according to Muñoz-Darias et al. (2005). The horizontal blue strip indicates the value of Ṗ-12 as derived in Sect. 3.
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