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Fig. 4.

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Histogram of the masses of the BH of the qBHXBs. The shaded grey region is adopted from Olejak et al. (2020), from which we derive the Gaussian kernel shown by the solid line. The shaded orange histogram corresponds to 104 boxy bulge qBHXBs (left panel) and 1.2 × 105 disc qBHXBs (right panel) used in this work.
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