Left panels: The significance level for the superposed epoch analyses of HCSC in MAM for the period 1968–2020 in the NH. The top panel show “A T” events subtracted “T A” events. The middle panel shows only “A T” events, while the bottom panel shows only “T A”. Right panels: Same procedure, only for the SH. Statistical significance after FDR is found in the NH when looking at the difference between the asymmetric events (top left panel) and for only the A→T events (middle left panel).