Hi folks, 1) when removing background using athena, there is an option of using a k-weight different than 1 (I am NOT talking about k-weight for FT). I noticed that changing this parameter the resulting chi(k) does not change significantly. Actually, going from 1 to 4 as a value for k-weight for Bkgd removal, the only effect I see is a significant reduction of the peak below the first coordination shell in chi(R) while the other features of the spectrum are essentially the same in terms of absolute and relative intensity. A drastic change in both chi(k) and chi(R) is seen if I use k-weight = 5 and above. What is the exact meaning of it? I know what the meaning is in the FT process, but I do not see the reason why I should use a weight different than 1 (let's say 3 for my noisy data) for background removal. How should I behave? SHould I take the largest value of k-weight so that the essential features of the chi(k) and chi(R) do not change? 2) In artemis, is it a bug or a wanted feature to have the possibility to activate more than one button for k-weight for the fit and FT? I suppose it is a wanted feature, but then I wonder what is the meaning of using more than one weight for the fit and FT. I am sure some of you can unveil this enigma. Ciao, Stefano -- ____________________________________________ Stefano Ciurli Professor of Chemistry Department of Agro-Environmental Science and Technology University of Bologna Viale Giuseppe Fanin, 40 I-40127 Bologna Italy Phone: +39-051-209-6204 Fax: +39-051-209-6203 "Fatti non foste a viver come bruti, ma per seguir virtute e canoscenza" Dante Alighieri - Inferno - Canto XXVI "Ihr seid bestimmt, nicht Tieren gleich zu leben, Nein, Tugend zu erringen und Erkenntnis" "Ye were not form'd to live the life of brutes, But virtue to pursue and knowledge high"