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Fig. 3

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Trend of the (U − B) color of RGB stars with their radial distance from the center of NGC 6752. Upper panel: the linearized RGB; its brightest stars (V < 12.5) were rejected. For demonstration purposes, the RGB was arbitrarily divided into two magnitude intervals at the level (U = 15.7) marked by dashed line, where stars are denoted by filled circles of different color. The lower panel shows the color-radial distance diagram of the same RGB stars; 100 pixels correspond to .

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