Fig. 10

a Experimental STEM image of a Mo−V−Te−Nb oxide catalyst. The image size is 2048 px × 2048 px, the width of the window in a sliding FFT is set to 500 px (shown schematically in the figure), and the window step size is 100 px. The top left corner inset shows schematically a stack of 2D FFT images formed during the sliding FFT procedure. The scale bar is 5 nm. b–g Results of NMF-based decomposition of sliding FFT data over the area in a into 3 components. Loading maps (b–d) associated with endmembers (e–g). The original image used in a is reproduced (adapted) with permission from He et al. [67]. Copyright (2015) American Chemical Society