05 dex; bottom panel: 22 turn-off thin disk stars with ? YII <0.05 dex and ? MgI <0.05. The symbols are those of Fig. 6.2, but including a colour code for the stellar metallicity. The dotted line shows the Nissen (2015) fit for solar type stars (here c = 0.1 dex), the red solid line (on the bottom) is the fit for the high precision sample of thin disk stars, Top panel: 342 stars with ? YII <0.2 dex and ? MgI <0.1 dex; middle panel: 123 turn-off stars with ? YII <0.1 dex and ? MgI <0 ,
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