Left and middle column panels: [C/H] and [C/Fe] as a function of [Fe/H] for our sub-samples of dwarfs (□), subgiants (△), and giants (°). Superposed symbols indicate the population classification: thick disc members (p), thin/thick disc (+), and one halo star (×). The remaining stars are thin disc members. Planet hosts are represented by filled symbols. The Sun’s position is also indicated. Each panel focuses on one sub-sample, and the two others are shown in light grey. Right column panels: [C/Fe] distributions comparing stars with and without planets.
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