Figure 11.

Unshielded OPM-MRX measurements of BNF-MNP (sample with dilution factor 1:20). The excitation coil is on when no FPGA data are available, e.g., in the time span from $20 \mathrm{m}\mathrm{s}$ to $30 \mathrm{m}\mathrm{s}$. The FPGA data were not averaged.