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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 Forum: Origin Forum Subject: Message: * HTML is OFF * Forum Code is ON Smilies Origin Ver. and Service Release (Select Help-->About Origin): OriginPro 2021b 9.8.5.212 Operating System: Windows 10 Hello, This seems like a very trivial question but I can't find any info anywhere. I have a multimodal histogram. It appears to contain 1 lognormal distribution and 2 gaussian distributions. I've been using the "Multiple Peak Fit" but can't figure out how to use two different peak functions. Using three lognormal profiles doesn't give me a desirable fit. Thanks in advance :) Sam   Check here to subscribe to this topic.