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The ratio RTMP versus coil radius rc for circular coils (bottom row) and figure-8 (top row) coil. RTMP is the ratio of the mean-squared electric field over the scalp region to that of the brain region for the coil geometries depicted in figure 6. For small radii the difference between the values of RTMP for the circular and figure-8 coils is quite pronounced. Therefore, to draw attention to this difference, the left plots cover 0–10 mm radii whereas the right plots cover 10–90 mm.
