Metallicity, extinction, and distance results for FGK star members of the five most populated Galactic OCs in the Cantat-Gaudin et al. (2020) catalogue, reflecting the typical precision of the StarHorse results as well as some systematic trends with effective temperature and surface gravity. The blue lines refer to the cluster median and the blue-shaded area to the median absolute deviation, while reference values are plotted as dashed orange lines. We note that the reference cluster metallicities are in fact iron abundances [Fe/H], which are only approximately equal to the total metallicity [M/H] determined by StarHorse.