Hi list, I'm running trac-all -prep -c but I have this error dtifit -k /Applications/freesurfer/subjects/subject_prova/Diff01/dmri/dwi.nii.gz -m /Applications/freesurfer/subjects/subject_prova/Diff01/dlabel/diff/lowb_brain_mask.nii.gz -r /Applications/freesurfer/subjects/subject_prova/Diff01/dmri/bvecs -b /Applications/freesurfer/subjects/subject_prova/Diff01/dmri/bvals -o /Applications/freesurfer/subjects/subject_prova/Diff01/dmri/dtifitError: bvecs and bvals don't have the same number of entries I'm noting that my original bvecs are 0 -0.460 -0.539 0.490 -0.071 0.226 0.463 0.483 -0.643 0.468 -0.730 -0.707 -0.318 0.175 0.488 0.4600 -0.395 -0.588 -0.706 -0.605 -0.607 -0.236 -0.180 -0.464 -0.562 -0.337 -0.699 -0.786 -0.786 -0.712 -0.3010 -0.795 0.419 -0.057 -0.793 -0.725 -0.708 -0.695 -0.609 0.333 0.413 -0.108 0.368 0.392 -0.004 0.476 and in dmri 000 bvals conversion is ok. What's happen? Why are there an error about conversion to FSL format? Thank you very much, I really appreciate your patience. Stefano