Number of cluster candidates versus the neural network quality flag value for the sub-sample of 106 sources studied in this paper. By construction, Q_NEURAL values smaller than 0.4 denote low-reliability detections. This figure confirms that this parameter indeed effectively separates real and spurious SZ identifications. However, we note that some of the unconfirmed sources with high Q_NEURAL values are located in areas of strong dust contamination, probably producing the false SZ detections.