Locations of our targets in the Gaia CMD. Hot subdwarf and WD candidates from Culpan et al. (2022) and Gentile Fusillo et al. (2021), respectively, that have parallaxes better than 10% are shown in gray. The dashed lines indicate the absolute Gaia magnitude region in which the UHE phenomenon occurs as uncovered by Reindl et al. (2021). The thin solid lines correspond to Montreal WD cooling tracks for WD masses of 0.2 (top right), 0.6 (middle), and 1.3 M_⊙ (bottom left).