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Dear Monika, > > I want to use eddy distortion correction of dsi data. We acquired diffusion volumes in A>P phase encoding direction and an additional B0 in R>L. I tried to run Topup on the B0 volumes but got an error message saying "error in size-match along non-concatenated dimension". That doesn’t sound like an error message I recognise from topup. Are you sure that doesn’t come from fslmerge (for example if you have a script that prepares the data for you that calls fslmerge)? Jesper > > Any help on this will be greatly appreciated. > > Thank you, > Monika