Dear Ifeffiters I have some more questions. 1. There is a k-weight button in the background removal column in Athena. How's that used and what's its significance? 2. Assume that I have collected data up to 14k, and I see that the signal beyond 12k is very noisy. I want to use the data up to 12k and within that data range pick a F-filter window of 2-10k or 3-10k. How do I go about this? Can I do that with the spline range (in k or E) options in bkg removal (Athena) column? I have gone through Bruce's documentations and have some sense, but not quite clear. Would appreciate your help. Warm regards. Shan -- ||||||||||||||||||||||||||||||||| Shantanu Behera Center for Advanced Materials and Nanotechnology Lehigh University 5, East Packer Avenue Bethlehem, PA 18015, USA