Distribution of the [NeV] (top) and [OII] (bottom) luminosities (in erg s⁻¹) of the [NeV] emitters and their parent populations plotted in logarithmic scale. Symbols and numbers are as in Figs. 4 and 5, respectively. The t-student test and Kolmogorov–Smirnov test consider as extremely statistically significant, the difference between the luminosity (in the [OII] line) distributions of [NeV] emitters (dashed curve) and their parent samples (dotted curve). The vertical lines and arrows represent the luminosities where the 3σ upper limits enter in the computation. The difference between [NeV] emitters and their parent galaxies remains statistically significant even if only the detections are considered.