Comparison of the location in the observed field of NGC 6752 of (1) two sub-populations of RGB stars, with δ(U − B) > 0.05 (red filled circles) and δ(U − B) < − 0.05 (blue filled circles), and (2) two sub-populations of SGB stars, fainter (magenta filled circles) and brighter (green filled circles) in the U magnitude. The same stars are shown with the same colors in the U − (U − B) and U − (B − I) CMDs of the RGB and SGB, respectively. The X and Y coordinates increase to the east and north.
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