Density maps of the [C/Fe] with respect to [Fe/H] as predicted by our model for the descendants of Pop III stars (shaded areas) and measured abundances (LTE) of stars in Sculptor (blue circles), Sextans (medium-blue hexagons), Carina (light-blue hexagons), Fornax (purple pentagons), the UFDs (yellow triangles), and the Milky Way (grey squares). All measured [C/Fe] abundances have been corrected for internal mixing (Placco et al. 2014). The black arrow shows the expected size and direction of how measured stellar abundances are expected to change because of NLTE effects in [Fe/H]. The shaded areas are coloured depending on the type of stars that polluted the descendants: 100% of the Pop III low-energy SNe (grey, E_SN < 1.5 × 10⁵¹ erg), 100% of the Pop III hypernovae (red, E_SN > 5.0 × 10⁵¹ erg), 50% of the low-energy Pop III SNe, and 50% of the core-collapse Pop II SNe (green). The densest areas (and most probable abundances) are coloured with darker shades. In all cases, f_mix = 0.063. References for the Milky Way and UFDs are listed in Sect. 5. The data of dSph galaxies are from Tafelmeyer et al. (2010), and from Lucchesi et al. (2020, 2023).