Fig. 10.
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Dependence of PD on spectral hardness for Cyg X-1, Swift J1727.8−1613 and GX 339−4. For consistency, the hardness ratio has been calculated the same way for all objects as a ratio of energy flux in 4–8 keV to that in 2–4 keV as measured by IXPE. The dotted line with 1, 2, and 3σ confidence intervals shows the linear fit to the data.
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