Fig. 4
Radio (NVSS) vs. [O III] line luminosity of the FRIICAT (black), FRICAT (red), 3C-FR I (green), and 3C-FR II samples (blue) The green line (blue). shows the linear correlation between these two quantities derived from the FR Is (FR IIs) of the 3C sample from (Buttiglione et al. 2010). The dashed blue-cyan line is instead the linear fit on both the 3C and the FRIICAT HEGs.
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