From top to bottom, the panels in turn are variations of the averaged values of the images of P = 4.2–5.7 minutes, 4 < v < 14 km s⁻¹, and Doppler velocity over the FOVs of the two LBs. The curves in the middle panels are discerned with respect to the positive and negative values. For brevity, the negative curves are multiplied by a minus. The black arrows point to the local maxima of the curves.