The left hand panel shows two histograms of the abundances displayed in Fig. 4, separating RGB stars (solid line) from TO and SGB stars (dashed line). A shift of + 0.2 dex has been added to the TO/SGB group to correct for the presumed effects of atomic diffusion (see text). The right hand panel shows a histogram of the whole sample and a double-Gaussian fit to the distribution.
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