Fig. 5
Hess diagrams of Fornax 4 after correcting for MW and Fornax field background contamination, with different cuts for the cluster and background population, at 32′′, 48′′, and 64′′ (the tidal radius). A metal-poor ([Fe/H] = −2.5 dex, solid) and metal-rich ([Fe/H] = −1.5 dex, dashed) isochrone at a fixed age of 14 Gyr are overlaid to highlight the shape of population features.
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