Vector point diagram of the stars with G < 19 in the direction of Liller 1 (small gray circles), showing the RA and Dec components of the Gaia DR3 proper motions referred to the systemic values quoted by Vasiliev & Baumgardt (2021). The large dashed circle is centered on (0, 0) and has a radius equal to 3 × σ_PM, with σ_PM = 0.5 mas yr⁻¹ being the proper motion dispersion of Liller 1 member stars. The spectroscopic targets are plotted with large symbols: large black dots show those classified as Galactic field interlopers due to their discordant proper motions, and large red dots and blue squares show the likely metal-poor and metal-rich members, respectively. The typical error bar is reported in the bottom right corner.