(a) Spatial distribution of the C-19 stream members with radial velocity measurements in the (ϕ₁, ϕ₂) coordinate. Similar to Fig. 2, the members from previous studies are plotted as transparent red and purple circles (Martin et al. 2022a; Yuan et al. 2022b; Bonifacio et al. 2024), along with the derived orbit (Ibata et al. 2023) and the simulated stream (Errani et al. 2022). All the candidates from this work are color coded by their spectroscopic metallicities. The confirmed members have metallicities below −3, which are highlighted with solid black circles. The rest are probable members denoted by dotted circles. Among all the confirmed members, those brighter than G = 16 are further highlighted with orange circles, which are just slightly clustered in the main body. (b) The C-19 stream in the (ϕ₁, v_r) space, where the radial velocity measurements are taken from Yuan et al. (2022b), Bonifacio et al. (2024), and this work.