Distributions of absolute K-band magnitude (left) and recession velocity (right) for the three ETG samples. The red histograms show the gETGs studied in Paper I (the dashed histogram in the left panel represents the gETGs included in the LoTSS DR2 area, the same region in which the mETGs and lmETGs were selected), the black histogram shows the mETGs sample, and the blue histogram represents the lmETGs. The lmETG sample is not complete, and this is clearly seen in the reduced number of galaxies below M_K > −23.5 and for v ≳ 6000 km s⁻¹.