There is an output text file with extension '.grid' that contains mean and standard deviation of lots of standard quantities for each traced WM region.

If your 3dTrackID command had '-prefix OUTPUT', then the the file would be called 'OUTPUT_000.grid'. It contains matrices of structural properties (including mean FA values of each tracked region). You can open and view it in any standard text editor.

You can also view it in SUMA:

$ suma -dset OUTPUT_000.niml.dset

or from the commandline with fat_mat_sel.py (this will make colorbar between 0 and 1, show the graph until you close it/hit a key in the terminal, and then also save the image):

$ fat_mat_sel.py --matr_in 'OUTPUT_000.grid' --Pars 'FA'     \
            -A 0 -B 1 --Hold_image --out_ind_matr

See 'fat_mat_sel.py -h' for more help/options.

--pt