M 31: age, mass, and extinction of 211 star clusters from (Vansevičius et al. 2009, as V09). Panels a), d), g) show results when a narrow extinction range of E(B − V) =  [0.04,0.5] is allowed in the model grid, compared to V09 values. Panels b), e), h) show results for a wider allowed extinction range [0.04, 1.0], compared to V09 values. Panels c), f), i) compare results obtained in a wide extinction range vs. the ones obtained in a narrow extinction range. In panels a), b), c), a density map of Fig. 3d is reproduced to show regions of age-extinction degeneracy. Error bars are computed as described in Sect. 2. Six clusters from V09, which have E(B − V) > 1, are not shown in panels g) and h). Dashed ellipses, numbered “1”, “2”, and “3”, describe majority of associated clusters in the age and extinction panels.