Comparison of the observed spectrum represented by pluses and synthetic spectra. The dashed black line is computed for a barium abundance [Ba/Fe] = −1.50 dex, which corresponds to the 3σ upper limit of Koch et al. (2013). The higher quality of the X-Shooter spectra permits the detection of the barium line. The blue line is computed with a barium value [Ba/Fe] = −0.81 dex, which corresponds to our result.