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Fig. 6

Estimated orbital period of GRS 1758−258 as a function of plausible masses MX of the compact companion and a Roche lobe filling star ±5 spectral sub-types around A5V. The assumed mass and radius of an A5V star are R∗ = 2 M⊙ and R∗ = 1.7 R⊙ (Cox 2000).
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