Combined age and metallicity distributions obtained for ID355. Lower left panel: joint probability distribution of age and metallicity of the inner (black) and outer (red) zones of ID355. Contours are at 68% and 95% probability. Upper left panel: marginalised probability for the age. Lower right panel: marginalised probability for the metallicity. Median and 16% and 84% intervals are indicated by solid and dashed lines, respectively.