Fig. 14.

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mF336W vs. mF336W − mF814W Hess diagrams of NGC 1868 (a1), NGC 1852 (a2), and NGC 2173 (a3) zoomed around the eMSTO. The blue and red lines are the boundaries of the eMSTOs. Panel b illustrates the scheme to derive the ΔX′ quantity for eMSTO stars, while the corresponding kernel-density distributions and cumulative distributions are plotted in panels c and d, respectively, for NGC 1868 (aqua), NGC 1852 (black) and NGC 2173 (orange). See the text for details.
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