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. Glyph-colour, blue indicates low anisotropy (local trough) (Voxel) Line-colour: thick-green: Maxima, thin-green: Minima, fine-blue: Saddle points Fig. 3. RGB representation: red:X, green:Y, blue:Z. Left: DTI eigenvector, brightness: FA. Centre: ODF-T maximum, brightness: corresponding PFA-T. Right: ODF-SA maximum

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