The geometry is depicted in Fig. 2. In reflection geometry, the incident light beam having a wavevector is specularly reflected from the surface of the substrate. An obstacle at the surface scatters the illuminating radiation in all directions causing coherent speckles across the detector. In our experiment, the obstacles are dried cells. They consist mainly of carbon which is highly reflective at XUV wavelengths, resulting in a lot of diffracted light from both the surface and the silhouette of the specimen. According to the Fraunhofer diffraction theory, the diffraction pattern corresponds to the three-dimensional (3-D) Fourier transform of the obstacle in the far-field.23 In other words, the idea of the current setup is to study the specimen not in the real space but in the Fourier plane. Full details and analytical equations for the scattering geometry are given in 13 and references therein. In the presented case, a slightly curved wave front is used for illumination. This has the advantage that the inner part of the diffraction pattern, which would otherwise contain the very intense central speckle, corresponds to a low resolution hologram of the specimen.15 The less intense central part is beneficial because the full dynamic range of the CCD camera can be effectively used in a single recorded image. In comparison, for pure CDI experiments, high dynamic range images must be stitched together from images taken with different exposure times to counteract saturation of the camera in the center.