Top panel: relationships between the current barium-star mass (M_Ba), the WD mass (M_WD), and the WD-progenitor mass (M_AGB, ini). Mild and strong barium stars are represented by open and solid dots, respectively. Their differing sequences are caused by the adoption of two different values for . Bottom panel: distribution of the “initial” mass ratio q′=M_AGB, ini/M_Ba, which should in principle be larger than unity. Mild and strong barium stars are represented by dashed and solid lines, respectively.