Comparison of the reference reduction (customized, at 50 mas, black curve) with the reduction at 100 mas (red curve) and the standard pipeline reduction (green curve). All spectra were extracted from the same region (BCDE12_CC, shown in the main text in Fig. 1). Central panel: Full spectrum. Lateral panels: Insets in the range of the Lyα drop (left) and of the emission lines (right). The difference between the reference and the other reductions is compared to the uncertainties.