Fig. 1.
Number of positive (red) and negative (i.e., noise; blue) peaks detected in the 118 ALPINE pointings as a function of the S/N. The errorbars are the Poissonian uncertanties. We can see that for S/N > 5.8 the number of positive peaks becomes higher than the number of the negative ones as the number of genuine detections with regard to spurious sources increases.
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