DEFit – DEER data analysis program
(Ilker Sen, Jean Chamoun, P. Fajer)

DEFit is a DEER data analysis program which assumes multi-Gaussian shaped distance distribution models, and utilizes curve fitting to find best parameters. The program is written in Matlab, and is provided as source code. Detailed information can be found in users manual.


-Desktop PC with non-ancient hardware
-Matlab 7, 2007, 2008 with optimization toolbox. Please note that we haven’t tested DEFit with older versions of Matlab ( < v7.0.1)
-(optional) Statistics toolbox. This is only required for F-test


-Download latest version below.
-Extract to any folder.
-Run Matlab.
-Add the extracted folder to Matlab’s path.
-Run DEFit.m

Latest version is 4.1 (Summer 2009)
Download the zip file here.
User’s manual is included in the package. But you can also get it here.
Results from the Breckenridge blind testing comparison of DEFit found here.
You may find a newer version on Ilker’s website.