Absolute carbon abundance as a function of metallicity for CEMP halo stars (filled circles), along with CEMP stars in the galaxies Canes Venatici I (cross), Draco (diamonds), Carina (stars), Sculptor (squares), Sextans (downward pointing triangles), and Ursa Minor (upwards pointing triangles). CEMP-no stars are marked in black, CEMP-s stars in green, CEMP-r/s in cyan, and CEMP stars with no classification are marked in grey. Grey dashed lines indicate the high and low A(C) values as found by Yoon et al. (2016) while the ellipses mark their groups II and III. The left panel shows stars with high Ba abundances but no Eu abundances as CEMP-s stars, while these are removed from the panel on the right.