Fig. 2.
Example of the spectra obtained with TNG/DOLORES (left panel) and GTC/OSIRIS (right panel) for two galaxy members, with magnitudes r′ = 18.7 and 21.8, in the clusters PSZ2 G079.36+38.06 (z = 0.299) and PSZ2 G126.57+51.61 (z = 0.816), respectively. Dashed lines correspond to the wavelength of the absorption features identified in each spectrum at the redshift of the clusters. Flux density is plotted in arbitrary units.
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