SWP ages computed through the isochrone placement technique. The difference tnoZ − t between the ages tnoZ computed without taking the surface metallicity Z evolution into account and the ages t computed considering such an effect, is plotted versus t. If the algorithm does not take into account that the sequences of isochrones are identified by the initial stellar metallicity, while we only know the present value, then the ages obtained are biased towards older values, especially for intermediate-age stars.
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