Fig. 2

Upper panel: absolute
MF606W magnitude of
the TO as a function of [M/H] for our GC sample (filled circles). Solid and dashed
lines display the theoretical calibration from BaSTI α − enhanced
isochrones for ages between 6 and 15 Gyr, in steps of 0.5 Gyr. Bottom
panel: as the upper panel but for .
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