Selection of IGIMF models representing the overall characterization of the IGIMF grid published at the CDS with this work. The metallicity used in this figure is [Fe/H] = 1, 0, −3, −5 from top to bottom; the SFR = 10⁻⁵, 10⁰, 10⁴ M_⊙ yr⁻¹ from left to _right. All IMF models are normalized to the total stellar mass formed over δt = 10 Myr to make the comparison with the canonical IMF (black dashed line in each panel) quantitative. To compare the slope variations we plot the Salpeter-Massey slope, α = 2.3, as a grey-line grid in each plot.