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Fig. 11.


Top panel: distribution of CN-weak (black) and CN-strong (red) stars with Galactocentric distance. Middle and bottom panels: resulting fraction of CN-strong to CN-weak stars as function of Galactocentric distance. The error bars are based on Poisson statistics. Gray shaded areas show the radial trend of the 65 CN-strong stars found by Martell et al. (2011).

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