Transverse slices 88, 129, and 144 (top to bottom) from a 3D registration experiment. The columns from left to right correspond to the template T, the deformed target S∘g, the target S, the deformed template T∘h, difference between the template and deformed target, and difference between the target and deformed template. If the registration were perfect, columns one and two would be identical and columns three and four would be identical.