Size of the shapelet-modeled eROSITA PSF in units of pixels and arcsec as a function of the EEF in the soft (blue circles: 0.2–0.6 keV), medium (green triangles: 0.6–2.3 keV), and hard (purple squares: 2.3–5.0 keV) energy bands. Similar to Fig. 3 but based on the three-band detection pipeline. The data and error bars, like in Fig. 3, correspond to the mean and standard deviation of the 2D 21 × 21 array that models the size of the PSF using shapelet coefficients as a function of EEF. We highlight with red and bigger markers the size of the PSF at an EEF = 0.75 used for the aperture photometry. For the purpose of visualization, we only plot data points between EEF 0.5 and 0.8.