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Fig. 3

image

Evolution of spectral parameters as a function of the Compton parameter y from the compps fits (color-coding as in Fig. 2). The overall trends of Ldbb/Lc ratio (top panel) and the reflection amplitude Ω/2π (middle panel) show qualitatively similar behavior to the nthcomp fits. We also see how the electron temperature kTe (bottom panel) increases when the flux drops below the critical limit of Fx ≲ 10-8 erg cm-2 s-1. The kTe increase may be caused by the change of geometry and seed photon source: disk truncation leads to fewer disk photons entering the Comptonized region, resulting in less efficient cooling of the electrons and thus higher equilibrium temperatures.

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