Mass ratio q distribution of the frequency of companions. The observed frequencies were corrected for incompleteness using the results obtained in Section 6 (averaged over semi-major axis 0.01 < a < 10 000 au). Blue solid line is for combination of all clusters; orange long dashed line is for the cluster cores, green dot-dashed line is for cluster tails, and the violet short-dashed line is for NYMGs (Gratton et al. 2024). Some of the distributions have been slightly shifted horizontally to allow the appropriate error bars to be distinguished.