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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 UserOriginal[/i] [br]Origin Ver. and Service Release (Select Help-->About Origin): 9.1.0 (64-bit) Operating System: Windows 8.1 Hello! I'm going to fit Gauss function to two peaks which are connected to each other. It's a part of a graph of X-ray powder spectroscopy (the probe was NaCl and the lamp had Cu anode, no monochromator was used). When I fit Gauss function to single peak (K_beta), it works correctly. However, I don't know how to fit this function to two different peaks which are interfering with each other (K_alpha). I tried to define a custom function which was a sum of two Gauss function (my professor told me to do it), but it wasn't working correctly, even if I had given the estimated parameters to Origin. I have been searching for it on many websites and in Origin help, but I haven't found the answer. Could you help me? [/quote]   Check here to include your profile signature. Check here to subscribe to this topic.