Example of the spectra obtained with GTC/OSIRIS (left panel) and TNG/DOLORES (right panel) for the two brightest cluster galaxies, G141.73+14.22 and G191.05+12.85, at z = 0.8208 and 0.0895, with magnitudes r′ = 21.9 and 14.8, respectively. Vertical dashed lines mark the absorption features identified at the redshift of the clusters.
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