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Fig. 1


Upper panel: the sub-samples of brighter (blue dots) and fainter (red dots) SGB stars isolated in the U − (B − I) CMD. Their CRDs are shown by the blue and red lines, respectively, in the lower panel; these are compared with the CRDs for the sub-samples of brighter (dotted line) and fainter SGB stars in the B magnitude. 100 pixels correspond to .

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