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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 Viktoriaa[/i] [br]Hi everyone, I would like to fit a curve with 4 Gausses. The width of Gauss1 and Gauss 2 should be the same, while those of Gauss3 and Gauss4 are independent. [img]https://my.originlab.com/ftp/forum_and_kbase/Images/1146_fit1.jpg[/img] How can I set up the constrain that three width values w1 w3 and w4 are to be fitted and w1=w2. Under constraints option I got syntax error message. Thank you in advance [/quote]   Check here to include your profile signature. Check here to subscribe to this topic.