M 31 galaxy star cluster sample of 238 objects from Vansevičius et al. (2009) (circles and stars) and the studied sample of 216 objects (stars) having galactocentric distance over 7 kpc. Panels show: a) U − B vs. B − V and b) U − V vs. R − I diagrams. The model grid (without extinction) used to derive physical parameters of clusters is displayed in the background with indicated reddening vectors following the Galactic extinction law. The continuous line traces PADOVA SSP of Z = 0.008.
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