a): [(C + N)/Fe] vs. [Fe/H] for normal K giants (stars: Meléndez et al. 2008; Ryde et al. 2010) and barium stars in this work (filled circle) and from the literature (open circles: Smith 1984; Barbuy et al. 1992; Allen & Barbuy 2006). b): [F/O] vs. A(O) for HD 123396 (filled circle) compared to (i) field stars – two barium stars (open squares: Jorissen et al. 1992), M giant stars (open triangles: Cunha et al. 2003), MS and S stars (crosses: Jorissen et al. 1992); and compared to (ii) GC’s stars – M4 (small filled triangles: Smith et al. 2005) and NGC 6712 (large filled triangles: Yong et al. 2008). All abundances were renormalized to A(F)_⊙ = 4.56 and A(O)_⊙ = 8.72. c): [F/O] vs. [s-process/Fe], where s-process stand for Y, Zr and Nd. The s-process abundances were taken from Allen & Barbuy (2006), Smith (1984, , and Smith & Lambert (1985, 1986, 1990, . The dotted lines indicate the solar abundances. Typical uncertainties are quoted.