Fig. 4.
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Zoom-in around the region of the SGB for the (mF814W, mF606W − mF814W) CMDs of NGC 6388 (left-hand panel) and NGC 6441 (right-hand panel). Stars highlighted in cyan are those selected via chromosome maps as belonging to chemically peculiar populations, and are therefore excluded from the analysis. Black symbols are instead stars belonging to the primordial population.
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