Sum of CNO elements [(C+N+O)/H] vs. [Fe/H] for CEMP-no stars with indications of upper limits as in Fig. 21 from Masseron et al. (2010). The large points represent MS or subgiant stars near the MS turnoff, while smaller points represent giant stars. The small horizontal lines on the circles denote low s-elements. Two lines of constant [(C+N+O)/Fe] ratios are indicated.
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