Hello, $FSLDIR/src/feat5/feat_model.cc contains all the code for design generation/processing etc. Kind Regards Matthew > On 8 Aug 2016, at 21:52, Ian Ballard <[log in to unmask]> wrote: > > Hello, > > Thanks for the response. I was wondering which source code file I could look at to see exactly how the orthognalization is done. > > Thanks, > > Ian