Fig. 3.
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Joint spectral fitting of NICER, NuSTAR and INTEGRAL/IBIS-ISGRI. The spectra were observed during MJD 60057.51–60057.53 for NICER (green), MJD 60057.44–60058.48 for NuSTAR (red for FPMA and black for FPMB), and MJD 60047.4–60064.4 for INTEGRAL/IBIS (cyan). The black dashed line shows the Gaussian component at 1.7 keV, likely an instrumental feature. The blue solid line represents the best-fitting model tbabs×(Gaussian+relxillcp).
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