Location of the 22 FR II radio galaxies with extended line emission in the spectroscopic diagnostic diagrams. Circles (squares) correspond to sources classified as HEGs (LEGs or unclassified) based on their nuclear emission line ratios (Buttiglione et al. 2010). The solid curves separate star-forming (S.F.) from intermediate galaxies (Int.), the dotted curve separates intermediate galaxies from AGNs. The black lines separate low and high excitation galaxies, LEGs and HEGS, respectively (Law et al. 2021).