Fig. 4.
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Differential reddening-corrected (IE − HE, HE) CMD for an annulus between 300 arcsec and 600 arcsec from the centre of NGC 6254. Error bars are in grey. A 13 Gyr old, [Fe/H] = −1.5 dex and α-enhanced theoretical isochrone from the BaSTI archive is shown in red for the sake of comparison.
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