BPT diagram, which uses the log([O III]/Hβ) and log([N II]/Hα) optical emission line ratios to separate sources into star-forming galaxies, composites, and AGN classes. To obtain robust classifications, we also incorporated log([S II]/Hα) and log([O I]/Hα) line ratios following Stampoulis et al. (2019). The colourbar indicates the separation between the eFEDS X-ray source and the HECATE galaxy in arcsec.