Fig. 12
Isochrones computed with the observed CNO and metallicity of the two s groups and the same age (13.5 Gyr) superimposed on the M 22 SGBs. The red and blue central tracks are the CNO-higher (s-rich) and CNO-lower (s-poor) best-fitting isochrones, respectively. For both we computed a couple of isochrones with the same chemistry, but with age varying of ± 300 Myr.
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