Fig. 6

As Fig. 4 for the derived 17O/18O vs. 12C/13C ratios. Note the extreme sensitivity of the 17O/18O to the stellar mass after the FDU. Most of the measured ratios lie within the values expected for masses 1.5–3 M⊙. The existence of extra mixing on the AGB phase would place any star in the region 12C/13C < 30 and 17O/18O > 4. A typical error bar is shown.
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