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Fig. 2


Joint 68%, 95%, and 99.7% (highest posterior) probability contours (top panels) of our fit to XUCS cluster (in blue) and to an X-ray selected sample of relaxed clusters (in red, from Andreon 2010). The bottom panels show the marginals: the posterior probability distribution of the gas fraction (bottom right panel) and the additional scatter of caustic masses (bottom left panel). The shading indicates the 68% (highest posterior) probability in the bottom right panel and the 95% probability in the bottom-left panel.

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