Bruce: I have encountered some strange behavior at the Bi L3 edge. I have a file which runs out about 1200eV above the edge (13419eV). While Athena does find the high energy when setting the default normalization and spline ranges, it does not plot any of the data beyond 14220 (about 800eV above the edge). In fact, there seems to be a hard limit of about 800eV above the edge for all data and this translates into the k-space plot as well. I am now unsure of what effect this might have on the back transform if the defaults are not touched but certainly the graphical setting of limits for normalization, spline fit, fourier transform and back transform wil not work since the plot does not show the complete data range. Another problem I have found is that the Auto Align feature is somewhat unreliable and does not always yield a visually correct shift. I haven't characterized when exactly this happens but it has seemed to work once on a file and then not work later on the same two files. Cheers, Carlo -- Carlo U. Segre -- Professor of Physics Associate Dean for Research, Armour College Illinois Institute of Technology Voice: 312.567.3498 Fax: 312.567.3494 Carlo.Segre@iit.edu http://www.iit.edu/~segre