Longitudinally and yearly averaged and (black lines), binned every 3.6° in latitude. The standard error of the mean in each binning interval is about 1 m s⁻¹ for and 0.4 m s⁻¹ for , and is not shown here. The magenta filling indicates the distribution of |B_r| (normalized to the same arbitrary constant in all time periods), which was averaged and binned in the same way as the flows.