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Fig. 6
Upper panel: spectral index obtained from a power-law fit to the Swift/XRT spectra vs. observation date. Lower panel: reduced χ2 of the power-law fit to the X-ray spectra. The two vertical blue lines indicate the location of the two VHE γ-ray flares at MJD 54 952 and MJD 54 973 that are discussed in Sects. 4.2 and 4.3.
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