Top: Chandra X-ray map of 3C388 (0.5−7 keV). The green annulus has been used for background subtraction, while the black regions have been used to extract the source spectrum. The central circle with a diagonal line shows the central AGN core, which was masked out from the analysis. Bottom: Chandra background-subtracted X-ray spectrum for 3C388 extracted from the black regions shown in the top panel. The red solid line indicates the best fit to the data as described in Sect. 3.3.1, while the lower panel indicates the reduced χ² statistics at each data point.