WISE results from near-UV to soft X-rays for a Wolter-I mirror including a long-period error and roughness. a) λ = 3000 Å: the aperture diffraction conceals most of the mirror defects, the HEW is the same as that a perfect mirror of the same size (Fig. 9a). b) λ = 2000 Å: the aperture diffraction is reduced and the PSF due to mirror shape becomes visible. c) λ = 100 Å; aperture diffraction fringes have completely disappeared, and the PSF is almost equal to the ray-tracing result from the the sole figure. Like the PSF in Fig. 14, the result is slightly asymmetrical on the side of the negative angle. d) λ = 30 Å. The PSF is still dominated by the figure, but some noisy features and a slight HEW increase already announce the appearance of the scattering.