Comparison of radio and Hα luminosities for the gETGs with available SDSS spectra. The diagonal line marks the empirical separation derived by Best & Heckman (2012) between sources in which the radio emission is dominated by star forming regions (to the left) from those in which it is powered by an AGN (to the right). The blue circles correspond to the sources located in the region of star forming galaxies in Fig. 12, the red squares are those located in the LINERs region, the gray ones are those for which no optical spectral classification is possible, the gray downward pointing triangles are upper limits.