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(a-f) Magnetic field maps (mT) of the two head-only gradient coil sets (a-c, HG1, X to Z coils; d-f, HG2, X to Z coils) at 660 A. The field maps are shown on the coronal (a,c,d,f) and the sagittal (b,e) mid-plane where positive z corresponds to the superior side. (g-i) Linearity error for HG2, X to Z coils, on the corresponding mid-planes. The circle is 26 cm in diameter.
