Converting 10-20 System locations to (average) MNI template coordinates

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I entered the coordinates you indicated into an MRI viewer (FSLview), having loaded an MNI template, but the point in space corresponding to each of the 4 sets of coordinate is always well outside of the brain (screenshot shows location of the putative F3 point).

1mm.png1919×1082 81.5 KB

Is it possible these are in fact not the right MNI coordinates? Otherwise, am I doing something wrong?

Thanks again.