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Fig. 1

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Position of the targets in the cluster color-magnitude diagrams. Upper panel: V vs. (U − V) diagram, where the arrows indicate the location of the two gaps discussed in the text (G1 and G2), and the magnitude corresponding to T = 20   000 K (the formal definition of the EHB). Lower panel: V vs. (B − V) diagram with superimposed the ZAHB model from Cassisi et al. (1999) used to estimate stellar temperatures. The star #37345 discussed in the text is indicated with an empty triangle.

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