Fig. 14

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Mean (J–H) colour versus mean (H–K) colour for models in the entire grid. Models using SPL are plotted in grey tones, and those with SDDO are coloured according to carbon excess (see Fig. 6). Observed carbon stars from Whitelock et al. (2006) are also plotted: orange symbols for Miras and cyan for non-Mira stars. The grey box centered at (0.5, 1.0) outlines the area in Fig. 15.
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