The enhancement of the signal achieved by polarizing in the polarization coil was measured by comparing the signals observed with the polarizing coil active to those without. These data are shown in figure 5. Integrals of the NMR peaks in these data indicate an enhancement of approximately 182, compared to the 212 fold increase in polarization field, indicating that relatively little mag-netization is lost in the adiabatic field turn-off. This also demonstrates the stability of the device, as the spectrum acquired without the polarization coil averaged over 14 hours.