Fig. 3.
Photon index Γ vs. the temperature at the inner edge of the disc for all the observations of XTE J1550−564 where a HFQPO was detected. We see that the temperature at the inner edge of the disc varies by about a factor of two while the photon index varies by close to 30%. Data from Sobczak et al. (2000), Remillard et al. (2002).
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