Comparison of the encircled energy in the inner part (<10ʺ) of the extended PSF between measured data and a simulation of perfect optics for all four Euclid bands. The near match at the core, based on a PSFex profile from our sky data, indicates our extended PSF accurately reflects expected performance. The slight disagreement between the simple, aberration-free model and the data at a radius below 1ʺ (10⁰) most likely stems from low-order aberrations introduced by optics. These aberrations tend to slightly broaden the core but have little to no effect on the extended PSF. The observation that the model-to- data discrepancy decreases with increasing wavelength tends to support this hypothesis, as optical aberrations are more pronounced at shorter wavelengths. It should be noted that the disagreement appears more pronounced due to the use of a log-log plot.