Ratio of dwarf-to-giant stars in the IMF, f_dg, plotted against the velocity dispersion of model galaxies, σ, for the CR-IGIMF run (black dots). The top and bottom panels are obtained by considering all stars in the model and those formed in situ, respectively. The green stars show the binned median trends, and the blue line corresponds to the IMF–σ relation from La Barbera et al. (2013). The orange circles with error bars show the latter relation corrected to an aperture of 1 R_e, and the red line corresponds to an infinite aperture (see text). The expected f_dg values for a Kroupa and Salpeter IMF are marked by dashed horizontal lines, and the dotted line marks the f_dg for an MW-like IMF in the model.