The similarity and complementarity between STEM and spectro-ptychography is further illustrated in Figure . Crystallinity was investigated using SAED (Selected Area Electron Diffraction). Figure and 6c present high resolution TEM images of a typical cluster at the surface of the Ti-doped hematite nanoparticles. The diffractograms were obtained using FFT and used for structural indexation (Figure ). More details are given in Figure . We can identify diffraction spots arising from hematite and pseudo-brookite structures, with their d-spacing at ~0.275 nm and ~0.355 nm, respectively.