The concentration of the ensemble cluster compared to previous observational results and theoretical predictions. Top panel: green horizontal line: ℒ-weighted average c₂₀₀ for the ensemble cluster. Shadings represent the 1σ error bar on the c₂₀₀, with contributions from the three terms, δ_c, s, δ_c, ν, and δ_c, j (inner dark green shading, intermediate light green shading, and external dark green shading, respectively). The two symbols with 1σ error bars labeled “GCLASS” represent the results of the dynamical analysis of GCLASS clusters, as obtained by B+16 (diamond) and as obtained in this work by including the new GOGREEN survey data for the GCLASS clusters. The symbols and 1σ error bars labelled “Lensing” and “X-ray” represent mean values from the literature for clusters in the same r₂₀₀ and z range as the clusters in our sample, obtained through the analysis of gravitational lensing and X-ray data, respectively (references are given in the text). Bottom panel: green horizontal line and shadings as in the top panel. Symbols with 1σ error bars are theoretical predictions from Bhattacharya et al. (2013), Dutton & Macciò (2014), Correa et al. (2015), Child et al. (2018), De Boni et al. (2013), Ragagnin et al. (2021) for a halo of the same M₂₀₀ and z as our ensemble cluster, and rescaled to the cosmological parameters used in this paper.