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The “broad iron spectral features” are often seen in X‐ray spectra of active galactic nuclei (AGN) and black‐hole binaries (BHB). These features may be explained either by the “relativistic disc reflection” scenario or the “partial covering” scenario: It is hardly possible to determine which model is valid from time‐averaged spectral analysis. Thus, X‐ray spectral variability has been investigated...
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