(Left) Maps for D12 of increases (or decreases) of the number of anomalies as a function of the middle day of the first (abscissa) and second (ordinate) considered 3-day periods. (Right) Maps of the corresponding p-values. The upper row is computed for the IntDst reference series, whereas the lower row corresponds to the Int(d(SYM-H)/dt) reference series. The p-values are evaluated only if there is an increase of anomaly rates in the second 3-day period as compared to the first 3-day period. Note the logarithmic scale of the plotted p-values: p = 0.0055 (the adopted level of statistical significance for individual bins) corresponds to log p = −2.26. Statistically significant bins are indicated by white dots. Blank bins are indicated by the white colour.