Level of helium enhancement among M3’s horizontal branch stars

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Fig. 2

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Same as Fig. 1, but for the HST F336W vs. (F336W−F555W) plane. Theoretical models for M_HB = 0.665 and 0.632M_⊙ are not shown here for clarity (see Fig. 3). The observational data are the same as in D13, as kindly provided by E. Dalessandro (priv. comm.).

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