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Hi, I haven't seen that before. Can you send us the motion parameter file? All the best, Mark > On 14 Mar 2018, at 15:11, Jingwei Li <[log in to unmask]> wrote: > > Dear experts, > > We are using mcflirt to do motion correction and generate the motion parameters. However, we found for one of our subjects, mcflirt creates all 0s for two translation dimensions, and almost all 0s (~1e-8) for one of the rotation dimension. > > However, the maximal relative RMS is not absurdly small because for the other two rotation dimensions, the values are much higher than other subjects. In summary, it seems that mcflirt treats this subject as only moving along a very specific direction, which we think is very unlikely. We are writing to ask if it is ok (or normal) to see a kind of output of mcflirt like this. > > Thanks, > Jingwei