Bruce, I supposed the answer would be a little inconvenient truth. I will follow your wise words. Thanks, euG Eugenio, I am afraid that the question, as posed, is somewhat unanswerable. Careful alignment (preferably to a reference) is essential and you should take care to use the same parameters for every data set. I don't know how to advise you about "rightness", but consistency is certainly a must-do. If you are looking at subtle changes in the XANES features, you might consider turning off the "flattening" display trick that Athena uses for displaying XANES data. HTH, B