Fig. 1
Thermal Comptonization index α for sources in different spectral states as a function of the electron temperature kTe. Reference papers: Cyg X–2, Farinelli et al. (2009); Sco X–1, GX 17+2, GX 340+0 and GX 3+1, Farinelli et al. (2008); GX 354–0, Di Salvo et al. (2000b); GX 349+2, Di Salvo et al. (2001), X 1658–298, Oosterbroek et al. (2001); GS 1826–238, Cocchi et al. (2010); 1E 1724–3045, Barret et al. (2000).
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