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Hi - this is because NIFTI (at the moment in FSL) has a limit on the size along each dimension (circa 32k). If you use the latest FSL (5.0.2) this should produce an ascii file for the tract_space_coord file, so this has no size limit. Cheers Saad On 6 Jan 2013, at 18:50, Hiroki Kurashige wrote: > Dear FSLers, > > I executed the probtrackx2 with --omatrix2 option and > got the file, tract_space_coords_for_fdt_matrix2.nii.gz. > In my understanding, this file is the list of x-y-z vectors for all target voxels. > Because I used the target ROI including 182024 voxels, > this file should include 182024 vectors. > Actually, however, the file included just one x-y-z vector. > > The other output files have no problem. > The number of columns in fdt_matrix2.dot is 182024 and the max intensity of lookup_tractspace_fdt_matrix2.nii.gz is also 182024. > > Thanks, > > Hiroki > -- Saad Jbabdi University of Oxford, FMRIB Centre JR Hospital, Headington, OX3 9DU, UK (+44)1865-222466 (fax 717) www.fmrib.ox.ac.uk/~saad