Abundance ratios [Ca/Fe] vs. [C/Fe] of CEMP-no stars. The same codes for the observations and models as in Fig. 1 are adopted; no data on Ca are provided by Masseron et al. (2010). A thick horizontal blue line indicates the approximate average of the [Ca/Fe] ratios. The location corresponding to a solar ratio [Ca/C] = 0 is shown with a red line. The star SMSS 0313-6708 (Keller et al. 2014) is represented by a brown point and is a lower limit on both coordinates.
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