Absolute K-band magnitude vs. luminosity at 150 MHz. The red symbols are the gETGs (M_K < −25.0), the black symbols are the mETGs (−25.0 < M_K < −23.5), and the blue symbols are the lmETGs (−23.5 < M_K < −21.5). The small dots mark the upper limits of the undetected objects. The large green dots represent the median radio luminosity in eight bins of absolute magnitude, and the solid (dashed) green line represents the best linear fit to the four brightest (faintest) galaxies bins.