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A break in the X-ray loudness of Markarian 590: evidence for an AGN spectral state transition?
Using decade-long multi-band {\it Swift} observations of the changing-look AGN Markarian 590, we identify a clear break in the dependence of the X-ray loudness parameter $α_{\rm ox}$ on the source accretion rate. This break could be potential evidence for an accretion state transition, analogous to
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