Fig. 8
Spectral index radial variations obtained as explained in Sect. 3.2. This figure shows β(r), while Fig. 6 shows β(r) averaged along the line of sight, i.e., 
. The different colors refer to the different physical structure adopted (blue for Keto et al. 2015 and red for Crapsi et al. 2007). The shaded regions show the error associated with the process.
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