Fig. 2.
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IXPE spectra of Cyg X-1 for which X-ray polarization is detected during the LHS and HSS. The photon index is Γ = 1.4, Eline = 6.5 keV, and χred2 = 158/149; see left panel (ID = 01002901). For the HSS spectrum, these parameters are Γ = 2.4, Eline = 6.4 keV, and χred2 = 151/149; see right panel (ID=02008601). The best-fit model consists of const*tbabs*(comptb + Gaussian).
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