Mass-Excitation (MEx) Diagram. The EELG candidates with NIRSpec spectra are in green symbols (circles for medium-resolution (MR) and triangles for prism). The stacks in this work are marked by star symbols. Galaxies in the control sample with NIRSpec spectra are shown with magenta circles (medium-resolution mode) and triangles (prism mode) symbols. The black dashed line indicates the demarcation between star-forming galaxies and AGN, according to Juneau et al. (2014). The black dashed-dotted line is the demarcation at z ∼ 2 (Coil et al. 2015). The black circles are EELGs up to z ∼ 1 (Amorín et al. 2015).