Hi, I have a weird problem with an output generated by FNIRT. The data contains certainly non-zero values (histogram or FSL-viewer), nevertheless when I call "fslinfo <filename>" the results report cal_max as being zero! 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 0.0000 cal_min 0.0000 file_type NIFTI-1+ According to the histogram viewer in FSL-viewer the largest value is about 660. Any help would be highly appreciated. Boogie