Visual representation of the shapelet-modeled eROSITA PSF. We show the radius of the survey-averaged shapelet-modeled eROSITA PSF in units of pixels and arcsec as a function of the EEF for the single band detection (0.2–2.3 keV). The files with the radius of the PSF are produced by the eSASS task apetool for each eROSITA sky tile. The uncertainties describe the variation of the PSF size within a sky tile. We highlight in red the radius of the PSF at an EEF = 0.75 that we use for our upper limit calculations which correspond with a radius of ~30″. The pixel size of the eROSITA data is 4″.