Gaia DR3 CMDs showing ED-2 6D members as blue circles. In the left panel, the dashed lines were constructed using a log₁₀(age/yr) = 10.20 and [Fe/H]= − 2.0 MIST v1.2 isochrone. In the right panel, we show bright, uncrowded, high-probability (> 0.99) members of NGC 6101 (Vasiliev & Baumgardt 2021) with red pluses (see Sect. 2.2). In both panels, the background shows a linear scale density of halo stars selected according to Eq. (1). The orange dots show the VMP cluster from Yuan et al. (2020). In the left panel, symbols marked by the horizontal lines indicate stars that have spectroscopic metallicities (see Fig. 3).