[ 52 , 86 , 121 ]), with higher [C/Fe] at lower [Fe/H], and a decreasing trend with increasing metallicity, although we find slightly lower abundances at higher metallicities than the cited works.
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The sentences
Our results indicate an almost flat behaviour, up to [Fe/H] ∼ 0.2, and then a slightly increasing trend, but we acknowledge that this trend might not be real since we could only measure upper limits.