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Screensize: 640 x 480 800 x 600 1024 x 768 1280 x 1024 UserName: Password: Anti-Spam Code: Format Mode: Basic  Help  Prompt  Format: Font Andale Mono Arial Arial Black Book Antiqua Century Gothic Comic Sans MS Courier New Georgia Impact Lucida Console Script MT Bold Stencil Tahoma Times New Roman Trebuchet MS Verdana   Size 1 2 3 4 5 6   Color Black Red Yellow Pink Green Orange Purple Blue Beige Brown Teal Navy Maroon LimeGreen Message: * HTML is OFF * Forum Code is ON Smilies [quote][i]Originally posted by natasab11[/i] [br]I hope that someone would be able to help me. I have to fit ESR spectra, and I did most of it good with differential Lorentzians and linear background. But on two graphs the central line with the linear part doesn't fit well. I put 3 differential Lorentzians for the peak, but the linear part still doesn't agree. So I extracted data and plotted central line with the linear part, but when I want to fit that new graph, message box pops up: Error: Too few data points, or data step is too big. I am asking, why I can't fit that graph, it has 400 data points, and how should I do it? [/quote]   Check here to include your profile signature. Check here to subscribe to this topic.