Gaia photometry color-magnitude diagram for BSSs classified by their ${\mathcal{M}}_{\mathrm{e}}$ based on the JS21 classification. Note that axes show the absolute magnitude for G_BP and the de-reddened color (G_BP−G_RP)₀. Low −${\mathcal{M}}_{\mathrm{e}}$ BSSs for OCs and GCs are represented by purple plus (+) symbol and orange dots, respectively. High- ${\mathcal{M}}_{\mathrm{e}}$ for OCs and GCs are represented by blue triangles and red squares, respectively.