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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 Krishnanmaha[/i] [br]Origin Ver. and Service Release (Select Help-->About Origin): Operating System: W10 Hi guys, I need to fit Debye model for heat capacity data. Here is the equation: C(T) = 9*R*(T/θ)^3∫0 to(θ/T)(x^4 *e^x)/(e^x-1)^2 dx. input data is T & C, i need to extract θ form curve fitting, please let me know how to do it. Your help or suggestions are highly appreciated. Note: I have read NAG tutorial which is not helping me. the equation link: https://faculty.csbsju.edu/frioux/q-intro/DEBYE.pdf [/quote]   Check here to include your profile signature. Check here to subscribe to this topic.