Fig. 8

X-ray luminosity of XB 1916-053 in units of 1036 erg s-1 versus the thermal bloating factor f of the companion star. The four curves correspond to different values of the NS mass: purple, green, light blue, and gold colours correspond to a NS mass of 1.4, 2, 2.1, and 2.2 M⊙, respectively. The peaks in the curves are at f ≃ 1.5.
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