Hello Sir, I had done fitting of a Cu2O data taken at SSRL EXAFS beamline in transmission mode, Stanford, by my research guide Dr. B. D. Shrivastava. I had used here the fiting procedure as discussed before in this mailing list. The fitted curves are coming nice, but the values of some fitting parameters are not reliable as shown * bold* below. *amp = 0.4898160 +/- 0.0469990 (1.0000) * enot = 7.6843630 +/- 0.4828620 (0.0000) alpha = 0.0022670 +/- 0.0030950 (0.0000) * ss011 = 0.0003280 +/- 0.0013130 (0.0030) * sscu11 = 0.0174780 +/- 0.0016220 (0.0030) *sscu11o11 = 0.0470530 +/- 0.0655560 (0.0030) * ss012 = 0.0070100 +/- 0.0044660 (0.0030) sscu12 = 0.0186980 +/- 0.0093570 (0.0030) * ss013cu11 = 0.0088980 +/- 0.0190580 (0.0030) * sscu13 = 0.0196150 +/- 0.0062940 (0.0030) sscu13012 = 0.0084870 +/- 0.0067030 (0.0030) * sscu11cu11 = 0.0071110 +/- 0.0132390 (0.0030) sscu12cu11 = 0.0111440 +/- 0.0139470 (0.0030)* Def parameters (using "FEFF0: Path 1: [O1_1]"): delr = 0.0041920 So, if someone can please tell me that where I had done wrong or what should I do to make things right I will be very thankful. The Artemis project file is attached herewith. With regards Abhijeet Gaur Research Scholar School of Studies in Physics Vikram University, Ujjain (INDIA)