Hi Gwenaelle, The results are: [neurobio@lr8to10-dhcp-131-36 K01_1_TBSS_all]$ cd stats/ [neurobio@lr8to10-dhcp-131-36 stats]$ ls all_FA.nii.gz mean_FA_mask.nii.gz mean_FA.nii.gz mean_FA_skeleton.nii.gz [neurobio@lr8to10-dhcp-131-36 stats]$ fslinfo mean_FA.nii.gz data_type FLOAT32 dim1 182 dim2 218 dim3 182 dim4 1 datatype 16 pixdim1 1.0000000000 pixdim2 1.0000000000 pixdim3 1.0000000000 pixdim4 1.0000000000 cal_max 0.9141 cal_min 0.0000 file_type NIFTI-1+ Thanks, Garth