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Fig. 9

image

Time evolution of the radial profiles of 12 + log (O/H) for the disks of NGC 300 (left panel) and M 33 (right panel) predicted by their own best-fitting models. Different line types represent the radial profile of 12 + log (O/H) at 2 (dotted line), 5 (dashed line), 10 (dot-dashed line), and 13.5 Gyr (solid line).

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