Individual galaxies in the IMF slope – metallicity plane. Yellow, green, blue, and red symbols correspond to four individual F3D galaxies, namely, FCC 083, FCC 167, FCC 153, and FCC 143, respectively, showcasing the variety of behaviors observed in our sample. Although each galaxy follows a rather well-defined IMF slope metallicity relation, there are clear differences among them, revealing that the observed scatter is due to internal variation and to changes from galaxy to galaxy. As in Fig. 4, the ξ value for a Milky Way-like IMF is marked with the dashed horizontal line.