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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 tjuxjliu[/i] [br]Origin Version (Select Help-->About Origin): 7.5 Operating System: WinXP In electron spin resonance spectra, the experiment gives the 1st derivative signal.Using the derivative of the Lorentzian function [img]/ftp/forum_and_kbase/Images/Function.gif[/img], where the dependence variable is P and the independence variable H, I want to fit the signal and don't know how to treat. Firstly I transform the experiment signal into integrated curve, then fit with Lorentzian function, but I always think that the results are dependent with the baseline. I saw the similar question in Tip of the Week, which is Fitting with Integrals, so I think it can be done with Origin, and I want to know detailed process. Xinjun [/quote]   Check here to include your profile signature. Check here to subscribe to this topic.