Fig. 2.
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Time evolution of the hardness ratio from NICER, NuSTAR, IXPE, and ART-XC data as defined in the text. NuSTAR and NICER data coloured in blue, red, and green refer to the three epochs described in the spectral analysis and used in the spectra shown in Fig. 3. The vertical orange line shows the subdivision of the IXPE observation described in Sect. 3.2.
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