Mean gas fraction and inter-quartile ranges (red points) for the XXL-100-GC clusters in eight redshift bins normalised to the Universal baryon fraction Ωb/ Ωm. The blue diamonds show the gas fraction expected from Eq. (7) at the median mass of each redshift bin in our sample. The magenta shaded area shows the value expected at r500 from the simulations of Planelles et al. (2013).
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