Fig. 2.
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Upper panel:F814W-(F275W − F814W) CMD of two RGBs belonging to 12 Gyr old isochrones with [Fe/H] = −1.6 (dashed line) and −1.3 (solid line), respectively. Lower panel: difference of the (F275W − F814W) colour at varying F814W between the [Fe/H] = −1.6 (dashed line) and the ‘verticalised’ metal-richer RGBs (solid line), taken as a reference (see text for details).
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