Estimates of the line-of-sight magnetic field strength as a function of time calculated using the weak-field approximation at the positions of three SSUBs (specifically a, c, and d from Fig. 6). The black line plots the frame-by-frame calculation and the red line the smoothed approximation over three frames. The dashed line indicates the time at which the solid profiles within Figs. 6 and 7 were sampled.