Fig. 7
Dartmouth isochrones for an age of 12.5 Gyr (black dashed) and 7 Gyr (red solid). The intermediate-age isochrone lies bluewards from the older isochrone at a fixed metallicity. Note that for a constant age and different values of [Fe/H] the slope of the RGB changes, while for a varying age and a constant [Fe/H] the slope of the RGB changes very little.
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