Running mean as a function of stellar mass surface density of the average metallicity profiles for the sample galaxies in the core-NS clump (orange symbols) and for those infalling in the Fornax cluster (green symbols). The black dashed lines correspond to the CALIFA ETGs with log(M_*/M_⊙)< 11.3 studied by Zibetti et al. (2020). The grey shaded region marks the radial range where the difference of spatial resolution between the CALIFA and MUSE observations affect the profiles.