Padova stellar isochrones with a range of ages (1, 2, 4, 8 and 14 Gyr from left to right in each panel), shown for a combination of HST/ACS filters. Panel a) The metallicity is set to be constant (Z = 0.001). Panel b) The metallicity has an initial value of Z = 0.0004 at 14 Gyr, and increases as age decreases (Z = 0.0006, 0.001, 0.0015, and 0.0024, respectively). Note the difference in width of the RGB.
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