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Fig. 12

Histograms exploring the three key samples of M 15 giants in [Ba/H]: a) all 63 W13 stars (blue) and 24 bright W13 stars (green); b) all 57 DO10W13 stars (blue) and 21 bright DO10W13 stars (green); and c) the W13 sample combined with the further 12 S97W13 stars and the further 19 DO10W13 stars with offsets applied.
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