Effect of a general increase by 2.0 dex of s-process elements (red line), as compared to their solar abundances (blue line). Compare with Fig. 5 of Reyniers et al. (2007). The Y ii line around 4823.3 Å is not as enhanced as the other s-process lines (red line). A better match to the Y abundance is obtained with [Y/Fe] = 0.5 dex (black line). Except otherwise stated, the atmospheric parameters used to generate the synthetic spectra are those listed in Table 4.