Fig. 4.
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Soft photon index Γ1 of bknpower obtained by free column densities versus the obtained column densities NH during the absorption. The black dots indicate the NH obtained by the spectral fitting down to 2 keV; while the red dots indicate the NH obtained down to 1.5 keV. The dashed line represents the value 7.1 × 1021 cm−2, which is adopted during our spectral fitting.
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