Statistics on extracted line (left) and continuum (right) features. The input median signal in the original training set is displayed, along with the median and standard deviation computed over the line (left) and continuum (right) training data sets. In the first case, the emission lines are well extracted, with signal variability only in regions of emission or absorption lines and without offset due to continuum leakage into line estimation. In the second case, the continuum does not display either discontinuities or acute signal variability in regions of strong emission or absorption lines.