Abundances of the three intrinsic S stars, with C and N (top panel), light s-process elements (middle panel) and heavy s-process elements (bottom panel). The error bars on the elemental abundances represent the total uncertainty calculated by quadratically summing the Δ _H−A values from the last columns of Tables 7–9 with the standard deviation due to line-to-line scatter, plusan extra 0.1 dex as uncertainty due to continuum placement.