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Fig. 3

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χ2 contour maps as a function of internal He spread, δY, and fraction of He-enriched stars, f2P . χ2 values are coded by colors. Best-fitting points (minimum χ2) are represented by red stars. Black solid lines indicate 1σ uncertainties, calculated from χ2 variations. The adopted model assumes a uniform He distribution. Panels a, b, c, and d correspond to clusters Hodge 11, NGC 1841, NGC 2210, and NGC 2257, respectively.

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