Left: thermal pressure compared with non-thermal pressure using three different models (black, pink, and green lines, Shaw et al. 2010; Fusco-Femiano & Lapi 2014; Nelson et al. 2014, respectively). Right: measured gas fraction profile azimuthally averaged (red line) and ignoring the merging region (black line), and corrected accounting for the contribution of a non-thermal pressure component enabling to match the cosmic gas fraction at R₂₀₀ and R₅₀₀. The horizontal line represents the universal baryon fraction (Planck Collaboration XIII 2016), the vertical lines represents the position of R₅₀₀ and R₂₀₀, and the yellow points are the universal baryon fraction depleted by the thermalized gas and by the star fraction. The pink, green, and blue lines represent the gas fraction we get by using different functional forms in order to reduce the observed gas mass fraction to the universal one.