[Sr/Ba] as a classifier of CEMP-s and CEMP-r/s stars. The filled red circles represent CEMP-r/s stars, filled black squares represent CEMP-s stars, and filled blue triangles and filled green pentagons respectively represent CEMP-s and CEMP-r/s stars in this work. The grid formed by the dashed black lines represents the region of CEMP-s stars, and the grid formed by the dotted red lines represents the region of CEMP-r/s stars put forward by Hansen et al. (2019). In panel (b) the solid black line at [Eu/Fe] = 1.0 separates the CEMP-s and CEMP-r/s stars according to the classification criteria adopted by Abate et al. (2016).