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If we assign opacity only at the corner where the spherical metric is 1, you can clearly see the outside of the brain- the shape of the gray matter. Those black spots are where the volume was clipped during measurement. Putting opacity at the planar anistropy corner produces this image, which is interesting to look at, because people are not entirely certain of exactly why there should be planar anistropy in measured data, since gray matter is isotropic, and the white matter is linearly anisotropic. Perhaps this sort of image can help show what's going on.