Scoring and classification of the S/N and CNN for cross-correlated spectra with the CO molecule. Left: Quantification of scoring performance with receiver operating characteristic curves (ROC). The plot shows the improvements in the ROC trade-off between TPR and FPR. The improvement is measured in terms of area under the ROC curves (AUC). The CNNs provide even better performance in finding CO molecules while limiting increments in FPR, as compared to the main tests. Right: Maximal amount of planets with CO that can be recovered in the mock data by the S/N, perceptron (PCT) and both CNNs, within a FDR ≤ 5% bound.