Dear Pierre,

After the centering correction, niak preprocessing for most of the dataset went well, though I had to change 'slice_timing.arg_nu_correct'  from 200 to '-distance 100' in order to remove significant partial distortions in 4 subjects. I have now an another issue from two sessions, each from two different subjects, that the coregistered functional image is rotated significantly, although it was given an appropriate center.
In this case, what can I check or do? I couldn't find the info from the QC manual.
Thank you your advice, always.

Best regards,
Kangjoo