Fig. 5

Trend of mean energies, stripes are those of Fig. 6. Photons used within 0.5–3.0 keV. The red dash-dotted line is intended to guide the eye in the lower panel. Top: thick symbols indicate data points with more than three photons while the smaller symbols refer to data points with fewer photons. Errors are obtained using the simulations of Sect. 4.1.2. Bottom: simulations for fixed temperature and fixed absorption along the jet axis.
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