# NOT RUN {
sjd = fsaverage.path(TRUE);
surface = subject.surface(sjd, 'fsaverage3', hemi='lh');
gc = geodesic.circles(surface);
vis.data.on.subject(sjd, 'fsaverage3', morph_data_lh = gc$radius);
vis.data.on.subject(sjd, 'fsaverage3', morph_data_lh = gc$perimeter);
# }
# NOT RUN {
# }
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