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Hi, My name is Yung at SUNY upstate and i've been trying to interoperate Freesurfer & FSL. I am currently having problems with the second step of "displaying FEAT statistics on Surface" (http://www.fmrib.ox.ac.uk/fsl/freesurfer/index.html) posted online. The creation of a registration transform is giving me the following errors. If i enter in the following command tkregister2 --s <subjid> --mov <functional image.img> \ --fslreg <transform martix.mat> --reg func2struc.dat --noedit the error ERROR: SUBJECTS_DIR undefined. Use setenv or -sd and when i try to enter an additional "--sd" argument the error ERROR: cannot determine type of <subject dir> occurs. I was wondering if perhaps anyone would be kind enough to lend a hand. thanks, yung