Diagram of [s/Fe] versus [Fe/H] (top) and [hs/ls] versus [Fe/H] (bottom) for several classes of chemically peculiar binary stars. Metal-rich barium stars (filled red squares); barium giants previously analyzed (red open squares); barium dwarfs (plus red crosses); CH stars (blue open polygons); yellow symbiotic (green symbols) and CEMP-s stars which are members of binary systems (red filled circles).