Figure 3:

Calculated magnetization versus time in the high-$B_1$ regime. Simulation details: resonance parameters from Table 1, except $T_2=2.25\mu \text{s}$ sweep rate $d\Delta B_0/dt=0.70\text{mT}\mu {\text{s}}^{-1}$ and, from bottom to top, 40 different $B_1$ values logarithmically distributed between 1.12 mT (bottom) to $3.56\mu \text{T}$ (top).