AJNR -- van Pul et al. 26 (3): 469 Figure 2

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FIG 2. Eigenvalue space plots as defined by Bahn (33), plotted for anisotropy index FA. FA is high (bright) for both ${lambda}$ ₃/ ${lambda}$ ₁ and ${lambda}$ ₂/ ${lambda}$ ₁ close to zero, which corresponds to a cigar-shaped diffusion ellipse. But FA is still relatively large for ${lambda}$ ₂/ ${lambda}$ ₁ close to 1, the pancake-shaped diffusion ellipse.