a) [Ba/Eu] against [Eu/H] for S97_W13 (blue). Dotted red line indicates the solar abundance. Dashed red line indicates the expected abundance from r-process only yields (Simmerer et al. 2004). b) [Ba/Eu] against [Eu/H] for the W13 sample (black). Grey arrows are the upper limits derived from the set of summed spectra. Magenta circles identify those points with [Ba/H] greater than –2.20 dex and that have measurements for Ba, La and Eu. c) As for b) but for [Ba/Eu] against [Ba/H]. d) as for b) but for [Ba/Eu] against [La/H]. e) As for a) but for [Ba/Eu] against [Ba/H]. f) As for b) but for [La/Eu] against [Eu/H]. g) as for b) but for [La/Eu] against [Ba/H]. h) as for b) but for [La/Eu] against [La/H].