Comparison of true contrast between the experimental (a) and the best fitting simulated (b) images of MgO. i and j index the intensity maxima, which were quantified with respect to the absolute intensity and geometric position. (c) The difference image between the experimental (a) and the best fitting simulated (b) images. (d) The difference image with enhanced intensity by adding the value of the mean intensity of the normalized simulated image. Note that all of the images are displayed with the same intensity scale.^[12]