Barium abundance results from the present study. Red filled star symbols show actual detections and EW measurements in Hercules (including total measurement uncertainties), while open triangles denote upper limits. The left (right) panel shows 2σ (3σ) detections. Red ellipses on the most metal-rich target indicate the error ellipses due to the Fe-blend; this source of contamination is much smaller for the more metal-poor stars (Sect. 3.3.1). The red solid triangles depict the two stars from K08. Gray squares are data for dSphs from the literature and the black points depict Galactic halo and disk stars from the compilation of Venn et al. (2004). Green symbols refer to the detections (stars) and upper limits (triangles) in Hercules by François et al. (2012). We also mark, by text, the location of the star Dra 119 that is deficient in heavy-elements (Fulbright et al. 2004).