Average [C/Fe] vs. [Fe/H] divided into seven metallicity bins (~0.25 dex). CEMP stars have been removed and carbon abundances have been corrected for evolutionary effects according to Placco et al. (2014). Left panel: comparison with classical DGs (coloured markers), Car, Dra, Fnx, Scl, Sex, and Umi are from Lucchesi et al. (2024), while LMC data is from Chiti et al. (2024) and Oh et al. (2024). [C/Fe] in classical DGs for which there are less than two stars are not displayed. Right panel: comparison with the MW. MW halo stars (black markers) are from Aguado et al. (2019), revised as in Arentsen et al. (2022). Inner Galaxy from PIGS/AAT (grey markers, Ardern-Arentsen et al. 2024) are divided into three groups, the whole sample (grey circles, solid line), the stars confined into the inner regions (grey crosses, dash-dot line, apocenter <3 kpc) and the halo interlopers (grey plusses, dash-line, apocenter >8 kpc). Bins populated by less than five stars have been removed. MW stars from PIGS are selected to have log g < 2.3, while compilation from Aguado et al. (2019) is restricted to stars with log g < 3.0. In both cases, AGBs are removed. [C/Fe] ratios from all the datasets are corrected for the evolutionary effects as in Placco et al. (2014). An offset of up to ±0.05 is added to the metallicity bins of the MW and DGs compilations to better display the markers and the uncertainties on the average [C/Fe].