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Fig. 3.

image

Evolution of the 10 keV absorption feature energy Eabs1(panel a), its width σabs1(panel b), the photon index Γ(panel c), and the reduced χ2 of the fits (panel d) as a function of the 1–30 keV flux obtained from the Insight-HXMT data (black points). Red and blue dots show the same parameters derived from two single NuSTAR observations and two combined observations (NuSTAR+Insight-HXMT), respectively. We used the model TBABS × (GAU+CUTOFFPL × GABS) here with the NH and Ecut fixed at 2.4 × 1022 cm−2 and 6.66 keV, respectively (see the text).

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