Median EW₀(Hα) (upper panel; EW₀( [OII]) if z > 0.5) and relative percentage (lower panel) as a function of stellar mass of galaxies with significant emission lines, i.e., EW₀(Hα) > 5 Å (if z ≤ 0.5) and EW₀( [OII] ) > 5 Å (if z > 0.5), for the different selection criteria (in violet the morphological ETGs, in light red the red-sequence galaxies, in dark red the red UVJ galaxies, in pink the red SED galaxies, in orange the quiescent galaxies, and in yellow the red & passive ETGs). The errorbars represent the error on the median. By convention, the emission lines are quoted with negative values.