Hi Saad, Here is the output. Regards, Massih __________________________ Massih/Tractography [mikulis4.uhnres.utoronto.ca:5]% bedpostx_datacheck c_AH c_AH/data data_type Float dim1 128 dim2 128 dim3 55 dim4 25 datatype 16 pixdim1 1.8750000000 pixdim2 1.8750000000 pixdim3 3.0000000000 pixdim4 0.0000000000 cal_max 0.0000 cal_min 0.0000 glmax 0 glmin 0 origin1 0 origin2 0 origin3 0 file_type ANALYZE-7.5 c_AH/nodif_brain_mask data_type INT16 dim1 128 dim2 128 dim3 55 dim4 1 datatype 4 pixdim1 1.8750000000 pixdim2 1.8750000000 pixdim3 3.0000000000 pixdim4 1.0000000000 cal_max 0.0000 cal_min 0.0000 file_type NIFTI-1+ num lines in c_AH/bvals 1 num words in c_AH/bvals 25 num lines in c_AH/bvecs 3 num words in c_AH/bvecs 75