Results of star cluster physical parameter determination tests. The provided differences are between the determined and input parameter values. Panel a) shows the median of age differences; b) – the median of mass differences; c) – the median of colour excess, E(B − V), differences. Red open circles mark median values of parameter differences determined based on the measurements through the aperture of R_ap = 0.5 arcsec. Blue open circles mark median values of parameter differences determined based on the measurements through the apertures of R_ap = 1.0, 2.0, and 7.0 arcsec, and then merged into a single dataset. Error bars show the 16–84 percentile ranges. Markers and corresponding lines are slightly shifted along the X-axis around the original input value for visual clarity.