Mass of BSSs. Left: mass of BSSs (found with isochrone models) vs. parent cluster age. Upper panel shows the mass of the BSSs, the middle panel shows the difference between the BSS mass and the MSTO mass, and the lower panel shows the mass excess factor, ${\mathcal{M}}_{\mathrm{e}}$− defined by JS21 as the difference between the BSS Mass and the MSTO Mass, normalized by the MSTO mass -, with respect to the parent cluster age. GC BSSs and OC BSSs are represented by red and blue points, respectively. We additionally draw two horizontal gray lines at the lower panel; dot-dashed gray horizontal line denotes the limit for M_BSS=2.0 × M_MSTO, whereas dashed gray horizontal lines denote M_BSS=1.5 × M_MSTO. Focusing on the lower panel and following JS21 classification, all stars between both horizontal lines are classified as high −${\mathcal{M}}_{\mathrm{e}}$ (most likely formed via collisions/mergers), and all stars under the horizontal dashed gray line are classified as low −${\mathcal{M}}_{\mathrm{e}}$ (most likely formed via MT). Right: same as the left side of the figure, but displaying Mass of BSSs vs. BSSs age (found with isochrone models).