Figure 6 (a) Illustration of input warping and how the regions get stretched/compressed. Without warping the function = x does not change the location and distances between the points, since the compression factor is equal to 1. If we use = k(x), the resulting compression factor would compress regions further away from the absorption edge x = E0. (b) Illustration of the extended XAS warping function to the pre-edge and post-edge regions of an XAS spectrum.