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Optimal channel orientations for the fetal OP position. Sensitivities are color-coded from purple (higher sensitivity) to red (lower sensitivity). The shaded areas represent optimal regions on the brain surface where each channel, indicated by the corresponding color, is sensitive to. (a) Channels in 20-40 mm. (b) Channels in 60-80 mm. (c) Channels in 100-120 mm.
