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Ratios of the refractory elements Mg, Si, and Fe, as well as S, for main sequence G-type stars in the solar neighbourhood (within 150 pc of the Sun, i.e. 1529 stars, from Hinkel et al. 2014). A representative error bar is provided, which represents the median spread of the respective elements. Black dots represent the location of the sample of stars studied in this paper and described in Table 1. The red dot indicates a star for which the ratio was not available in the Hypatia Database, and which was inferred from the median of the known abundance values (see Appendix A). All values are normalised by the solar abundance values according to Eq. (1).

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