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Fig. 12

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Stacked spectra of passive galaxies for the density and mass groupings of J0152.7 (left) and J1252.9 (right). Spectra of similar density and stellar mass in the two clusters show similar features in general, though with weaker 4000 Å breaks in J1252.9, and the strong (but noisy) H6 line visible in the J1252.9 low-mass sample. All wavelengths shown are in the rest frame.

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