Comparison of the metallicity distribution functions of the PISNe(Z-4) model (in red) and a set of observed galaxies (in blue) in three luminosity ranges. The solid red and blue horizontal lines indicate the full extent of the stellar metallicity distributions in the simulations and observations, respectively. The orange points show the mode of the [Fe/H] model distribution (see Appendix A). The purple triangles and red points represent, respectively, the median and mean of metallicities for each observed galaxy. The number of the spectroscopically confirmed member stars with metallicity estimates is indicated.