Hi fsl, Thanks so much for 5.0.9, lots of useful improvements! I have a few questions/requests... bedpostx has a new model (model=3) instead of using a stick kernel to represent a fibre compartment, a “zeppelin” axially symmetric tensor can be used. Can anyone recommend a good reference to read up on this zeppelin model and how it performs compared to the stick model? select_dwi_vols allows quick extraction of a certain b-shell from DWI data- This is great! Could a future release also output a new bvecs file? When shells are interleaved, it's annoying to create a new bvecs file of just a single shell. eddy will generate a rotated bvecs file. Awesome, thanks Jesper !! best, Mark