Fig. D.1
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The [Fe/H] differences between predictions from various ML methods and Harris (1996) reference values for globular clusters. Each panel represents a cluster, with histograms of [Fe/H] differences for the four ML methods explored in Sect. 6: this paper, Andrae et al. (2023), Zhang et al. (2023), and Gu et al. (2025). The mean and standard deviation of the differences are annotated only for our method.
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