Left panel: pixel distribution in the combined dataset map. The solid green curve shows the result of a Gaussian fit and indicates the noise level (σ = 68.4 μJy beam⁻¹). Right panel: number of positive (yellow histogram) and negative (black histogram) detections as a function of the pixel threshold σ_p for a fixed island threshold σ_f = 2.7 in the combined dataset map. We note that the number of detections is a differential value and not cumulative with decreasing σ_p.