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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 EnriqueFA44[/i] [br]Hello everyone. Maybe someone could help me. I'm trying to perform a non-linear fit of x,y data. With the graph active, I go to Analysis => Fitting => Nonlinear curve fit =>Open Dialog When the dialog window opens, the categories of the equations do not appear. Also, when I try to add an equation in .FDF format I get an error message: NLSF category not found for ....model The problem is that the equations category is not activated. I use Origin Pro 2023b, 64 bit SR1, Academic. [/quote]   Check here to include your profile signature. Check here to subscribe to this topic.