Dear FSLers, I ran the tbss_non_FA script on my data, and got the results with no error! Later i extracted the MD values and found them to be very low, somthing like 0.000774498559 So i checked my files and it appears that my all_MD_skeletonised has low values example 0.00064... I saw a previous post that got recommended avwutils, but i dont even have that command! "command not found" Any help to solve this problem? If avwmaths can solve it, how can i add this command? Please note that the FA processs went smoothly! Thank you in advance, Walid