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Fig. 6.
Colour–magnitude diagrams of EXT8 and the Galactic GCs M 15, M 92, M 30, NGC 4147, and M 5 (in order of increasing metallicity). In each panel, the red curve is the EXT8 ridge line and the blue curves are the ridge lines for the Galactic GCs. The boundaries of the instability strip (IS) are indicated in the CMD of EXT8.
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