Hardness ratio plots presenting the hardness ratio distribution for all the selected candidates (magenta), the five confirmed XDINSs on the western Galactic hemisphere and recently proposed candidates (green; Pires et al. 2015, 2022), and the synthetic INS population from (black; Pires et al. 2017). The applied cut to select the soft X-ray emitting candidates from all the eROSITA sources above the applied flux limit (grey) is indicated by the black dashed line and is based on simulated black body spectra of varying temperature and absorption strengths (blue lines). (See the text for additional information on these simulations.)