Fig. 5.
I vs. V − I CMD from FORS2, overimposed with a BaSTi isochrone of 12.7 Gyr and [Fe/H] = −1.1 (Z = 0.004) (magenta line). Stars within 0.9 arcmin of cluster center are selected. The mean magnitudes and colors of 7 RR Lyrae are shown with blue crosses. Large red dots are stars identified in Gaia within 25 arcsec of cluster center.
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