FORS2 R_SPECIAL band finding charts of the fields containing the five INS candidates. We indicate the X-ray sky localisation from XMM-Newton (green; 90% confidence region; Table 2), the X-ray sky position from eROSITA (blue; 90% confidence region; Kurpas et al. 2024a), and the nearby field sources identified from a SExtractor run (brown, arbitrary radii; Bertin & Arnouts 1996). (Bottom right:) X-ray-to-optical flux ratio vs hardness ratio diagram, indicating the five candidates (black markers), the known XDINSs on the western Galactic hemisphere, including the recently discovered candidate eRASSU J131716.9–402647 (magenta; Kurpas et al. 2024b), as well as other soft X-ray emitting sources, namely AGNs (Salvato et al. 2026), coronal emitters (green; Freund et al. 2024), CVs (blue; Ritter & Kolb 2003; Guillochon et al. 2017), low-mass XRBs (red; Avakyan et al. 2023), and high-mass XRBs (orange; Neumann et al. 2023).