Zoomed in cut of ν_⊥ for the strong field and radial driving case after t = 101.1 seconds. Black lines of u_⊥/c₀ = ±0.001 are overplotted to indicate the location of positive and negative areas of u_⊥/c₀ (same format as bottom left panel in Figure 3). Red, black (non-contour) and white lines are as in Figure 2. The blue horizontal line indicates the line through which we take the time-distance plot in Figure 8.