Stacked spectrum (black solid line) and 1σ uncertainty (gray filled area) and pseudo-continuum (green solid line) used to compute the indices listed in Table 4. The wavelength interval used to compute the EW is delimited by two black vertical dotted lines. The name and location of the main spectral features are indicated by dashed lines as in Fig. 11. The final EWs, computed as the median and 1σ uncertainty measured after perturbing the spectrum 1000 times, are annotated on top of each panel.