Plots of epoch-superposed daily numbers of anomalies in the D12 series, considering IntDST (in nT·hr, left) and Int(d(SYM-H)/dt) (in nT, right) for different upper thresholds on Dst and SYM-H. Solid lines indicate the superposed anomaly rates (upper row) or geomagnetic activity in the reference time series (lower row) during Days −1 to +5 from the epoch (Day 0), whereas dashed lines show the same quantities for the remaining days. Error bars show the one-standard-deviation half-widths.