Top panel: light curve of 3C 345 in X-rays, as derived from Swift/XRT data, in units of counts s−1. The verticaldashed line indicates the 2009B flare. Bottom left panel: light curve of the soft and hard X-ray flux, in erg s−1. The threshold energy is fixed at 2 keV. Bottom right panel: light curve of the hardness ratio, as defined in Eq. (2). The vertical dashed line indicates the 2009B flare.
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