Stacked differential spectra between RDAGN hosts and their controls in the [N II] doublets + Hα (green dashed lines) wavelength range. Stacking is done in subsamples with four L_AGN bins (powerful to weak from top to bottom) and in four radial bins (center to outskirts from left to right). The red lines are the fitting results for the emission lines. During the fitting, we assume that the three emission lines have individual Gaussian profiles. The equivalent width of the Hα and its signal-to-noise ratio derived from the fitting results are listed in each panel. RDAGN hosts, especially the low-luminosity ones, have an emission line excess in their nuclear regions (leftmost panels). High L_AGN RDAGN hosts show weak emission line deficiency in their outskirts (right panels).