Panel A): abundance pattern of the heavy elements in two classical CEMP-s stars CS 22948-027 and CS 29497-034 (blue diamonds and blue pentagons) and compared to the abundance pattern of the classical r-rich EMP star CS 31082-001 (black dots). The blue solid line represents the abundance pattern of the r-process elements in the solar system. Panel B): same as Panel A), but for the three low-Sr/Ba stars studied here (open pink symbols). In this figure, the abundances are represented not by ratios compared to the Sun (as in the previous figures), but by the other classical notation log ϵ: the logarithm of the number of atoms for 10¹² atoms of H, scaled to the abundance of europium. The abundance pattern of the three low Sr-Ba stars (Panel B)) present many similarities with the abundance pattern of CS 22948-027 and CS 29497-034 (panel A)).