Fig. 5
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32 HD models (red and blue dots) together with observational data (gray symbols) from M23 in the Teff-log ɡ-plane. Red indicates models of solar; blue models of 1/10 solar metallicity. The subset of systems also analyzed in M18 is depicted by gray squares. Most of the observed systems have slightly super-solar metallicity. One system with Teff < 4000 K is not shown.
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