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Fig. 20

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Comparison between a synthetic (upper panel) and an observed (lower panel) colour-magnitude diagram for the horizontal branch of M22. Red squares are metal-poor stars (in the lower panel, stars of Groups 1 and 2); blue triangles are metal-rich stars (in the lower panel, stars of Group 3). In the lower panel, stars not observed in this paper are dots. The region of the HB observed in this paper is marked with a rectangle in both panels.

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