HLD and CCD for ULXs taken from Gúrpide et al. (2021a) and Pintore et al. (2017), respectively. Left panel: Several ULX sources with different time periods, including PULXs and non-PULXs. All luminosities and fluxes are shown without absorption effects. The lightly shaded red and purple data points correspond to the sources studied in this work. The dashed black lines represent 10 and 100 times the Eddington limit for an NS with a canonical mass of 1.4 M_⊙ (∼2 × 10³⁸ erg s⁻¹). Right panel: CCD generated from flux ratio calculations in the 2–4 keV, 4–6 keV, and 6–30 keV energy ranges using the optimal fits described in Table 1. The lightly shaded silver dots represent the sources analyzed in this study.