Hi Mohamed: It is hard to help you without some more information. The coordination number (CN) is a little bit complicated by the high correlation it has with the value for S02, degeneracy, and the normalization edge step. You have to have all of those things correct to get the CN correct. If you are just starting out, I'd suggest reading my book chapter and some of the tutorials on the www.xafs.org web site. If you send me an email, I'll send you my book chapter. Cheers, Shelly Kelly dr.sdkelly@gmail.com On Thu, Apr 22, 2010 at 1:50 PM, mohamed sobhy wrote:

Dear all I am trying to fit some data of coordination number 8, but I always find the fitting of the first shell give the coordination number only about 0.5. I do not know what is wrong. Do I need to fit first and second and third shells altogether, and if that is right how Can I do that?? Thanks

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