Same as Fig. 14, but for [La/Eu]. 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. Panel a: grid formed by the dotted red lines represents the region of CEMP-r/s stars put forward by Frebel (2018). Panel b: we can see that all the CEMP-r/s stars but two fall inside the grid formed by the dotted red lines bound by 0.0 < [La/Eu] < 0.6 and 0.0 < [Ba/Eu] < 1.0. The gridformed by the black dashed lines bound by 0.5 < [La/Eu] < 0.7 represents the uncertain region in the upper boundary of the classification put forward by Frebel (2018) for CEMP-r/s stars.