2) Perform N3 Correction on each dataset with AFNI 3dUniformize
3dUniformize  -anat  <AFNI BRIK>  -prefix <pname>

 Class Example:  (from within lc_play/ directory)
     foreach x (1 2 3 4)
3dUniformize  -quiet  -anat mprage{$x}+orig  \
-prefix mprage{$x}_n3
     end
Volume
preprocessing
Segmentation
Tessellation
Inflation
Manual Editing
Re-inflation
Fix topology
Final Surface
Volume/Surface
postprocessing
Cutting &
Flattening