Fig. 6
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X-ray luminosities of B-supergiant HMXBs (from Table 5) and O-star HMXBs (from the list of Krtička et al. 2018) estimated using Eqs. (11) and (12) inserting the wind terminal velocity derived from Eq. (8) calculated using observed X-ray luminosity. Plotted against observed X-ray luminosity. The pink line denotes the one-to-one relation.
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