Spectral and morphological properties of the 11 FEM classes: D4000_n, EW([OII]λ3727), and Sérsic index as a function of class number. The division between red passive and blue active based on D4000_n according to Kauffmann et al. (2003) is marked with a black dashed line. The range of mean values of Sérsic index for VIPER red passive and blue star-forming galaxies obtained by Krywult et al. (2017) are marked with black solid and dashed lines, respectively. The [OII]λ3727 line has not been detected in the majority of galaxies within classes 1–5 (for 96, 91, 85, 59, and 72%, respectively).