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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 omermar[/i] [br]Origin Version (Select Help-->About Origin): 7 SR4 Operating System: win XP with SP2 Hello, I have a series of data, where X is time and Y is amplitude. By looking at the data it's obvious that there are two frequencies - fast and slow, and I wish that origin will find them for me. How do I do that? I have tried using analysis-->FFT , but I don't understand how to control it or how to interpretate the results... Thank you. Thank you. [/quote]   Check here to include your profile signature. Check here to subscribe to this topic.