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Fig. 4.
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Averaged unfolded spectra of sources showing a high (Γ ≥ 4), moderate (4 > Γ ≥ 2), and low (2 > Γ) photon index, respectively, when fitted with NH fixed. For the gamma distribution of this fit, see Fig. 3. For improved visualisation, the data were put into bins with a width of 0.05 keV.
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