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Fig. 1.


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Cartoon representing the “q” diagram for XRBs, adapted from Fender et al. (2004) and Fender & Belloni (2012), which depicts the progression of an XRB outburst through the different spectral states. An XRB starts an outburst in the low-hard state, progresses to the hard state through intermediate states to the high-soft state, then down to the soft state, and then back to the low-hard state to begin again (described in more detail in Sect. 1).

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