Fig. 4.

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Observed brightness distribution of the various samples normalized at the μ300 = 44.5 erg s−1 Mpc−2 bin. The histogram uses top-hat bins, and the curves are running averages using a Gaussian with σ = 0.2 dex. ACT lacks clusters with a normal brightness (μ300 ≈ 44.0 erg s−1 Mpc−2), whereas X-ray selected samples lack most clusters with μ300 ≲ 43.7 erg s−1 Mpc−2.
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