[Sr/Ba] ratio vs. [Ba/Fe]. The black filled circles represent the normal EMP dwarfs and giants studied in the frame of the ESO Large Programme First Stars (Cayrel et al. 2004; Bonifacio et al. 2009) and the stars studied homogeneously by Siqueira-Mello et al. (2015). The black open circles are for CEMP stars studied in the frame of this ESO Large Programme or taken from the literature (Depagne et al. 2002; Sivarani et al. 2004, 2006; Barbuy et al. 2005; Behara et al. 2010; Spite et al. 2013; Yong et al. 2013). The green filled squares show normal metal-poor stars studied in this paper, and the open green squares denote the C-rich stars. Note the very peculiar position of the CEMP star SDSS J0222–0313. In this star the first-peak heavy elements (such as Sr) seem to be more enriched than the second-peak heavy elements (like Ba).