Cluster mass-concentration vs. mass for all three stacks with model 24. The magenta contours indicate the run with free concentration (flat prior 0 <  log c₂₀₀ <  1), while the yellow contours display the run with the ΛCDM relation of Eq. (20), highlighted in the shaded regions for 1 and 2σ constraints. The contours are 68% constraints. The points are the weak-lensing analyses by Johnston et al. (2007) (triangles), Mandelbaum et al. (2008) (downwards triangles), Okabe et al. (2010) (curly squares), Oguri et al. (2012) (cross), Okabe et al. (2013) (open square), Sereno & Covone (2013) (open circle), Umetsu et al. (2014) (curly diamond), Umetsu et al. (2016) (diamond), Okabe & Smith (2016) (filled square), Umetsu & Diemer (2017) (filled diamond), and Cibirka et al. (2017) (filled circle), all corrected to be (1 + z)^0.38c₂₀₀ following Child et al. (2018). The error bar at the bottom is from Mandelbaum et al. (2008).