(a) Histograms of the number of positive and negative peaks as a function of S/N. The scatter plot indicates the false detection rate as a function of S/N. The dashed line marks the detection threshold of S/N > 4.2, corresponding to a 12% spurious rate (the dotted line). (b) Completeness (black line) as a function of intrinsic flux and effective survey area (red line) in which a source can be detected with S/N > 4.2 as a function of the peak flux per beam. The vertical line marks the typical flux at the detection threshold of S/N > 4.2. (c) Ratio between measured and intrinsic fluxes as a function of S/N. Red squares with error bars indicate the median and standard deviation. The flux boosting is less than ∼10% at S/N > 4.2.