Investigating the placement of radio AGNs with various linear, radio extents on the HID. The color reflects the linear extent classification (see Sect. 5.4): C, CO, CSS, FR0, FRS, and FRIIC are all compact classes, “G” stands for GRGs, and “Norm.” indicates those with a linear extent between compact and giant. The hollow points are those that could be blazars (see Sect. 6 for more details). The histograms show the distribution of the normalized number of counts for different classes in hardness and L_tot. The mean error is shown in the lower-left-hand corner. The two comparison samples are included and shown as in Figs. 4a and 6a. We see no conclusive evidence for a separation between the various populations.