Left panel: color-magnitude diagram in the (m_F275W, m_F275W–m_F336W) plane. Black points represent stars from our catalog with good photometric quality. The optical counterparts to M3B, M3D, and M3F are marked with orange, yellow and green squares, respectively. Right panel: Same CMD as shown on the left, but zoomed in to focus on the regions around the counterparts. Error bars for each counterpart reflect the corresponding photometric uncertainties. Overplotted are the He WDs cooling tracks from Cadelano et al. (2020). These correspond to stellar masses, ordered from right to left, between 0.17 M_⊙ and 0.46 M_⊙, as indicated by the colorbar.