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Studies of the long-term spectral variations have been used to constrain theemission processes of black hole candidates. However, a common scenario whichis able to explain the emission from soft to hard X-rays has been proposed onlyrecently. Here, we use XMM and INTEGRAL data on 1E 1740.7-2942 in order todemonstrate that Comptonization plays an important role in producing highenergy photons, as predicted by the current modeling scenario.

Comptonization in 1E 1740.7-2942 spectra from 2 to 200 keV