Global properties of Ton 2. Panel a: spatial position of sources centered on Ton 2, with stars observed by APOGEE-2 highlighted with the same color-coding as in Fig. 2, and stars with RV information (red open circles) from the literature (Baumgardt et al. 2019). The black dashed circle highlights the projected half-light radius of Ton 2, r_h, l = 2.89 pc, while the large black circle shows the two times (2 × r_h, m) projected half-mass radius (r_h, m = 4.6 pc) from Baumgardt et al. (2019). Panel b: proper-motion distribution of sources toward the Ton 2 field, with blue dotted lines highlighting the nominal Gaia EDR3 proper motions of the cluster (e.g., Vasiliev & Baumgardt 2021). Panel c: radial velocity vs. metallicity of our members compared to APOGEE-2S field sources toward Ton 2. The [Fe/H] of our targets were determined with the BACCHUS code (see text), while that of field stars are from the ASPCAP pipeline. The red box limited by ±0.15 dex and ±15 km s⁻¹ and centered on [Fe/H] = −0.70 and RV = −178.61 km s⁻¹ encloses our potential cluster members.