Validating the approximation of the long-range PSF impact by a constant inside the lunar disk. (A) Logarithm of the filter used for the validation: parametric filter given by the euvi_psf.pro procedure of SolarSoft with the central pixels set to zero inside a window of size (2b + 1) × (2b + 1), with b = 64. (B) Observed image inside a window containing the lunar disk. (C) Convolved image inside a window containing the lunar disk. The window intensity is almost constant.