Fig. 6.
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Swift-XRT X-ray spectral parameters and flux versus time of Mrk 421 from a log-parabolic best-fit model with Epivot = 5 keV. From top to bottom: α, β, hardness ratio, and flux in the soft (0.3–2 keV, gray circles) and hard (2–10 keV, black diamonds) energy bands. The time ranges of the IXPE pointings are indicated by the gray shaded regions.
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