Main-ELG Hα luminosity as a function of the r-band absolute magnitude, color-coded by redshift. On the background we show in gray the parent-ELG sample distribution, which has no cuts in flux nor S/N. For both populations we display random subsets of 30 percent of the total to avoid saturation. From left to right, we show the full sample (0.02 < z < 0.22), the lower-z bin (0.02 < z < 0.12), and the higher-z (0.12 < z < 0.22) one. The horizontal lines represent our lower completeness limits in luminosity (see the text for details).