Top: [Sr/H] as a function of [Ba/H]; bottom: [Ba/Sr] as a function of [C/H]. We note the offset in the trends between VMP and the CEMP stars. Two stars in the bottom panel (one VMP and one CEMP-s), lie between the two levels at [C/H] ~2.5; they are the two variable AGB star candidates. The dashed and dotted lines indicate the average [Ba/Sr] ratios of the two groups of stars (see text).