– the mni is in mni space and brainshift corrected (if you did perform brainshift correction).
– native is in space of the postop image (e.g. postop_tra.nii or rpostop_ct.nii)
– scrf is in space of the anatomical images (e.g. anat_t1.nii) and is similar to native but brainshift corrected – i.e. if you compare the two, you should see the amount of brainshift
– the acpc fields are coordinates relative to the AC/PC system (auto-converted/marked as defined in Horn 2017 neuroimage).
Also thanks for your nice comments in the other post from my side :)