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  "note": "transformation_matrix maps moving level-0 voxel (x, y, z) -> fixed level-0 voxel (x, y, z) (x, y, z = zarr axes 2, 1, 0; voxel centres at integers): the refined best-fit affine of ufsm reg. The residual non-affine displacement is in field.json / field.f32. Landmarks: certified evaluation boxes, moving points from the full map (affine + field)."
}