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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 linnap[/i] [br]Origin Version (Select Help-->About Origin): V6.1 Operating System: Windows Xp Professional Dear Sir/Ms I would like to ask a question about using of the origin, and hope that can get your kindly help. I plot a curve based on the data fiven, and then used the "first order exponential fit" to fit my curve. It done very well with that command. I want to know how can I calculate the fitting parameters, y0(offset of y), A(amplitude) and t1(decaying constant term)? Thank you for your concern! Yours truely linnap [/quote]   Check here to include your profile signature. Check here to subscribe to this topic.