Fig. C.1.
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Diagnostic plots for selecting radio AGN. Red points mark the sources classified as radio AGN after combining all four diagnostics, and black points show the star-forming/radio-quiet AGN (SF/RQAGN) sources. (a)Dn(4000) vs L1.4GHz/M⋆ plot. The dashed curve marks the division used for radio AGN and SF/RQAGN from Best & Heckman (2012). (b)LHα versus L1.4GHz plot, with the separation line from Best & Heckman (2012). (c) BPT diagram for the sources. The dashed curve shows the semi-empirical relation from Kauffmann et al. (2003). (d) WISE colour-colour plot for sources with the division line from Sabater et al. (2019).
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