FSL's TBSS is probabilistic, and the goal is to show a distribution, not a
representation; most of the "pretty pictures" with individual polylines come
from programs that use deterministic tractography (i.e. DTI Studio).
FiberViewer (via UNC's MIDAG site) or medINRIA have some nice visualization
options. You can input the same ROIs you used in TBSS (normalized to native
space) to extract tracts within these programs.
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