Can Compton scattering increase the energy of photons?

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I've read (in Hagai Netzer's book The Physics and Evolution of Active Galactic Nuclei) that "Comptonization in the [black hole's accretion] disk atmosphere can increase the energy of some photons..."

I thought Compton scattering could only decrease a photon's energy. What am I missing?
 

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Vanadium 50
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The electrons are moving.
 
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