Example of a Euclid chromatic PSF for an assumed SED of a SBc-type galaxy at a redshift of one. The flux in the image was rescaled to its maximum value and oversampled by a factor of three with respect to the native VIS pixel size of 0′.′1. Diffraction spikes are clearly visible at a significant distance from the centre despite the blurring due to the chromaticity. The full width at half maximum, including its variation across the field of view, is $0\stackrel{{}^{\prime \prime }}{.}{1564}_{-0\stackrel{{}^{\prime \prime }}{.}0040}^{+0\stackrel{{}^{\prime \prime }}{.}0019}$, comparable with the Euclid pixel size, so images will be undersampled at the Nyquist limit. The ellipticity is ${ϵ}_{1,\text{PSF}}={0.017}_{-0.024}^{+0.038}\text{ and }{ϵ}_{2,\text{PSF}}={0.001}_{-0.020}^{+0.042}$, with the super script and subscript denoting absolute ranges.