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Unshielded OPM-MRX setup with possible MRX excitation fields of up to 100 mT. The battery powered notebook, the USB-oscilloscope and the OMG control electronics are visible on the upper part of the figure. The OMG’s sensor head and the MRX excitation-coil are visible in the lower part of the figure. The position where the MNP sample was later placed is indicated by an arrow. The power amplifier is not visible, as it is located at a distance of about 3 m.
