Evolution of the LOS magnetic field strength averaged over multiple pixels for each of the upper (top panel), central (middle panel), and lower (bottom panel) red boxes overlaid in Fig. 3. The red curves plot the magnetic field averaged over the red crosses within each box, and the black curves plot the average magnetic field across the entire red box (±one pixel to either side for the central box). These apparent oscillations are clearly sustained and in phase across multiple pixels in these data.