Solar abundances (Asplund et al. 2009, thick lines; the dashed lines connect the elements with even and with odd atomic number) compared with the photospheric abundances in G191−B2B (blue circles) and RE 0503−289 (red squares). Arrows indicate upper limits. Open symbols for Tc mark the detection threshold for the two stars and the triangle is a typical Tc abundance found in red giants (see text).
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