Fig. 7
Q parameter (panel a)) and Q-Q parameters (panel b)) vs. metallicity diagrams for clusters with age derived beyond 1 Gyr. The clusters are colour-coded according to their type, as in Fig. 6. Large dots are for group 1 while small dots are for group 2 clusters. Black dots are SSP models with age extending from 1 Gyr to 13 Gyr, downwards in panel a) and upwards in panel b)).
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