Distribution of EW(Hβ) and EW(O iii) for our sample of galaxies selected in Sect. 3.1. We lined the histogram with different colors; red for the EELG fraction (EW(O iii) >100 Å based on Amorín et al. 2015) and blue for the non-EELG subset. We emphasize, with vertical continuous lines, the empirical limits for starburst galaxies (EW(Hβ) >30 Å based on Terlevich et al. (1991) and EELGs, as well as, with vertical dashed lines, the median distribution for the whole sample (black), and the EELGs (red) and non-EELGs (blue) (the values are given in the legend). The standard deviations of the entire distribution are 0.37 and 0.42 for EW(Hβ) and EW(O iii), respectively.