Fraction of mass in stars, gas and total baryons at R₅₀₀. Blue stars and red triangles represent the stellar mass fraction (Chiu et al. 2016, CMM16) and the gas-mass fraction at R₅₀₀, respectively. The black points represent the sum of the two (i.e. the total baryon mass). For SPT-CLJ2 146-4632 there are no stellar mass fraction measures available. Magenta points show the gas and total baryon fraction of five clusters with M₅₀₀> 4.5 × 10¹⁴M_⊙ from the cosmo-OWLs simulations (Le Brun et al. 2014, LMS14). The yellow area is the baryon fraction as measured from Planck Collaboration XIII (2016). The dashed black line is the variation of gas-mass fraction with mass in the REXCESS sample (Pratt et al. 2009, PCA09).