Fig. 2.
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The spectral hardness versus intensity diagram for all the RXTE data to 2005 from GX339-4 (blue) and Cyg X-1 (red), shifted in intensity so that the transition from soft to hard overlapped. Hardness ratio is defined as the ratio of counts in the energy bands 6.3–10.5 and 3.8–6.3 keV. (Data from Belloni 2010.) The Cyg X-1 Suzaku data used here is shown as the magenta star.
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