Raw tomographic energy dispersive diffraction imaging (TEDDI) images obtained from mapping of a catalyst body: (a) a 'YT' map generated from continuous measurement of one-dimensional 'Y' scan-lines in the centre of the catalyst body during calcination; (b) a two-dimensional 'XY' map of a pellet at a selected temperature point during the calcination process (to relate the XY map to a specific temperature point the sample is rapidly quenched to 25°C after the selected temperature is reached); and (c) typical total spectrum contained in one pixel of a TEDDI image. The blue pixels represent spectra with a low number of total counts, and the red pixels represent regions with a high number of counts (Reprinted with permission from (14). Copyright 2009 American Chemical Society)