Top right panel shows the normalized confusion matrix of the best RF model trained on EW values obtained from the fit method, while the left panel shows the normalized confusion matrix of the RF best model trained on values obtained from bands-based method. The k-fold validation for both gives exactly the same CV score, 69±1%, indicating that any failure of the RF algorithm to correctly predict all the spectral classes is not due to inaccurate measurements but due to the intrinsic scatter of the EW within this range of spectral classes.