@pimms.param<EOL><INDENT>def voxel_to_native_matrix(mtx):<DEDENT>
return pimms.imm_array(to_affine(mtx, <NUM_LIT:3>))<EOL>
sub.voxel_to_vertex_matrix is the 4x4 affine transformation matrix that converts from a
subject's (0-indexed) voxel indices to that subject's 'native' orientation; this is the
orientation matrix used when exporting a subject's images, and should be the orientation
encoded in the subject's image data.