Metallicity map based on the calibrations of Curti et al. (2017, 2020b) in the 12+(O/H) scale. For the E galaxy, spaxel-by-spaxel information is provided. For the external regions, the value obtained from the integrated spectra is assigned to the entire aperture. The region where the galaxy L7 appears in projection over E, is indicated with a dotted line. The line fluxes were corrected with the mean A_V value for the apertures. The faint grey lines correspond to two low-level isocountours of the Hα emission (Fig. 2c) (see text).