Hi Chris, Thanks for the bug report -- that is clearly a problem. I'll look into it and get back to you. B ________________________________________ From: ifeffit-bounces@millenia.cars.aps.anl.gov [ifeffit-bounces@millenia.cars.aps.anl.gov] on behalf of Christopher Patridge [patridge@buffalo.edu] Sent: Wednesday, April 11, 2012 10:39 AM To: XAFS Analysis using Ifeffit Subject: [Ifeffit] difference spectra function in (D)Athena Hello Mailing List, I have a question about the difference spectrum function. I chose difference spectrum in norm mu(E) in the Demeter pull down menu. I set the standard and chose another spectrum. Plotting both the difference and spectra gives me the image attached. Is the difference shifted significantly to lower energy? If so, why does it change its energy scale relative to the plotted spectra? Is there a setting I can change or could this be a small bug? Thank you all, buena salud, Chris Patridge -- Christopher J. Patridge PhD. Contact: (315)-529-0501