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Fig. 8.

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HID for FR I–II HERG–LERG sources. In both plots, FR I-LERGs are plotted as red squares, FR II-LERGs are purple diamonds, and FR II-HERGs are blue circles. The histograms show the distribution of the normalized number of counts for different classes in hardness and Ltot. All contours show a smoothed Gaussian KDE enclosing 68% of the data points. The mean error is shown in the lower-left-hand corner. Panel a: emphasis placed on the two comparison samples, with the XMM AGN sample depicted by the solid outlined contour with blue filling and the BASS sample depicted by the dashed-dotted outlined contour with gray filling. Panel b: plot (a) but with emphasis placed on the difference between the FR I-LERG, FR II-LERG, and FR II-HERG populations and their placement with respect to the comparison samples, showcased with corresponding contours and shading. We see a clear separation between FR I-LERGs and FR II-HERGs.

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