Spectral extraction regions for the three analyses described respectively in Sections 2.1 (upper left panel), 2.2 (upper right panel), and 2.3 (lower panel). In all cases the “on” region is shown in red, the background control region in green and the masked fluctuations in white. In the upper right panel, the “on” regions used for the spectral analysis of the Eastern and Western lobes of XMMU J170147.3−421407 are shown in cyan. All images show the XMM-Newton data (sum of PN and MOS cameras) in the 2 − 10 keV band.