PSF simulation obtained from Eq. (9) with an elliptical mirror, illuminated by a spatially incoherent source of 0.5 mm diameter at λ = 30 Å, with top-hat intensity profile. The parameters f, R₀, and L₁ are the same as for the simulations of Fig. 4. The radiation source is at a distance of 50 m from the mirror entrance. The peaks appear smoothed to the angular diameter of the source (2 arcsec).