Dear Stephen,
Thanks a lot the link. As far as I understand, the scaling factor (determinant) won't be changed by the non-reference-volume, so it doesn't matter using this option or not in the sienax script. However, using MNI152_T1_2mm as non-reference-volume in the sienax script seems strange, because MNI152_T1_2mm is the reference volume in the pairreg registration.
Thanks,
Gabor
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