Fig. 7.

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ROC analysis: True positive rate versus false discovery rate for different thresholds in Φ (th). Our improved far-side maps (three-day averages) are used and the minimum active-region area is fixed at Smin = 1000 μhs. Random detections would fall on the black dashed line. For all thresholds th, the outcome is clearly above this diagonal. The optimal threshold, th = −3.5σ, corresponds to the point that is farthest from the diagonal. It is reported as a horizontal dashed line in Fig. 4b.
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