A(C) vs. [Fe/H] diagram for CEMP stars compiled by J. Yoon et al. (2016). In this plot, cyan color indicates CEMP-r/s stars. Binary stars are represented by eight-pointed stars, and stars with no information on their binary status are indicated by cross symbols. Open and filled red circles indicate binary and single CEMP-s stars, respectively. CEMP-s stars with no information on their binarity are represented using red open triangles. Open and filled hexagons in blue represent binary and single CEMP-no stars, respectively. CEMP-no stars with no information on their binarity are indicated by blue open squares. Group III CEMP-no stars are represented using green symbols: binary and single stars are represented by open and filled pentagons, respectively. Skeleton triangles represent stars with no information about binary status. Program stars are represented using magenta color. HE 1148−0037 is represented by a filled triangle, and HE 1246−1344 is represented by a filled square.